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计算.(1)492425×(−5);(2)(−78)×12×(−117)(3)-7.8×(-8.1)×0×|-19.6|;(4)−|−0.25|×(−5)×4×(−125).(5)314−516−(−134)−356+1237−(−1247)(6)-|-32|-(-12)-72-(-5)
题目详情
计算.
(1)49
×(−5);
(2)(−
)×12×(−1
)
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
).
(5)3
−5
−(−1
)−3
+12
−(−12
)
(6)-|-32|-(-12)-72-(-5)
49
×(−5);
(2)(−
)×12×(−1
)
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
).
(5)3
−5
−(−1
)−3
+12
−(−12
)
(6)-|-32|-(-12)-72-(-5)
24 24 25 25
(−
)×12×(−1
)
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
).
(5)3
−5
−(−1
)−3
+12
−(−12
)
(6)-|-32|-(-12)-72-(-5)
7 7 8 8
1 1 7 7
−|−0.25|×(−5)×4×(−
).
(5)3
−5
−(−1
)−3
+12
−(−12
)
(6)-|-32|-(-12)-72-(-5)
1 1 25 25
3
−5
−(−1
)−3
+12
−(−12
)
(6)-|-32|-(-12)-72-(-5)
1 1 4 4
1 1 6 6
3 3 4 4
5 5 6 6
3 3 7 7
4 4 7 7
(1)49
24 |
25 |
(2)(−
7 |
8 |
1 |
7 |
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
(6)-|-32|-(-12)-72-(-5)
49
24 |
25 |
(2)(−
7 |
8 |
1 |
7 |
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
(6)-|-32|-(-12)-72-(-5)
24 |
25 |
(−
7 |
8 |
1 |
7 |
(3)-7.8×(-8.1)×0×|-19.6|;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
(6)-|-32|-(-12)-72-(-5)
7 |
8 |
1 |
7 |
−|−0.25|×(−5)×4×(−
1 |
25 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
(6)-|-32|-(-12)-72-(-5)
1 |
25 |
3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
(6)-|-32|-(-12)-72-(-5)
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
▼优质解答
答案和解析
(1)49
×(−5)
=(50-
)×(-5)
=-50×5+
×5
=-250+
=-249
;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. 49
24 24 2425 25 25×(−5)
=(50-
)×(-5)
=-50×5+
×5
=-250+
=-249
;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 125 25 25)×(-5)
=-50×5+
×5
=-250+
=-249
;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 125 25 25×5
=-250+
=-249
;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 15 5 5
=-249
;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
4 4 45 5 5;
(2)(−
)×12×(−1
)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. (−
7 7 78 8 8)×12×(−1
1 1 17 7 7)
=
×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
7 7 78 8 8×
×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
8 8 87 7 7×12
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. −|−0.25|×(−5)×4×(−
1 1 125 25 25)
=-(
×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 14 4 4×4)×(5×
)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 125 25 25)
=-1×
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 15 5 5
=-
;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 15 5 5;
(5)3
−5
−(−1
)−3
+12
−(−12
)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. 3
1 1 14 4 4−5
1 1 16 6 6−(−1
3 3 34 4 4)−3
5 5 56 6 6+12
3 3 37 7 7−(−12
4 4 47 7 7)
=(3
+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 14 4 4+1
)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
3 3 34 4 4)-(5
+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 1 16 6 6+3
)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
5 5 56 6 6)+(12
+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
3 3 37 7 7+12
)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
4 4 47 7 7)
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
24 |
25 |
=(50-
1 |
25 |
=-50×5+
1 |
25 |
=-250+
1 |
5 |
=-249
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. 49
24 |
25 |
=(50-
1 |
25 |
=-50×5+
1 |
25 |
=-250+
1 |
5 |
=-249
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
25 |
=-50×5+
1 |
25 |
=-250+
1 |
5 |
=-249
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
25 |
=-250+
1 |
5 |
=-249
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
5 |
=-249
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
4 |
5 |
(2)(−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. (−
7 |
8 |
1 |
7 |
=
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
7 |
8 |
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
8 |
7 |
=12;
(3)-7.8×(-8.1)×0×|-19.6|=0;
(4)−|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. −|−0.25|×(−5)×4×(−
1 |
25 |
=-(
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
4 |
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
25 |
=-1×
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
5 |
=-
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
5 |
(5)3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87. 3
1 |
4 |
1 |
6 |
3 |
4 |
5 |
6 |
3 |
7 |
4 |
7 |
=(3
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
4 |
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
3 |
4 |
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
1 |
6 |
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
5 |
6 |
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
3 |
7 |
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
4 |
7 |
=5-9+25
=21;
(6)-|-32|-(-12)-72-(-5)
=-32+12-72+5
=-104+17
=-87.
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