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计算:(1)-16-57+48+12-78;(2)334+2.25−838−12512;(3)3.5÷78×|−34|;(4)−24×(−12+34−13);(5)(-3)2+[20-(-2)3]÷(-3);(6)−23÷49×(−23)2;(7)10+(-2)2×(-5).
题目详情
计算:
(1)-16-57+48+12-78;
(2)3
+2.25−8
−12
;
(3)3.5÷
×|−
|;
(4)−24×(−
+
−
);
(5)(-3)2+[20-(-2)3]÷(-3);
(6)−23÷
×(−
)2;
(7)10+(-2)2×(-5).
(1)-16-57+48+12-78;
(2)3
3 |
4 |
3 |
8 |
5 |
12 |
(3)3.5÷
7 |
8 |
3 |
4 |
(4)−24×(−
1 |
2 |
3 |
4 |
1 |
3 |
(5)(-3)2+[20-(-2)3]÷(-3);
(6)−23÷
4 |
9 |
2 |
3 |
(7)10+(-2)2×(-5).
▼优质解答
答案和解析
(1)原式=(-16-57-78)+(48+12)
=-151+60
=-91;
(2)原式=(3
+2
)-8
-12
=6-8
-12
=-2
-12
=-14
;
(3)原式=
×
×
=
;
(4)原式=-24×(-
)-24×
+24×
=12-18+8
=2;
(5)原式=9+(20+8)÷(-3)
=9+28÷(-3)
=9-9
=-
;
(6)原式=-8×
×
=-8;
(7)原式=10+4×(-5)
=10-20
=-10.
=-151+60
=-91;
(2)原式=(3
3 |
4 |
1 |
4 |
3 |
8 |
5 |
12 |
=6-8
3 |
8 |
5 |
12 |
=-2
3 |
8 |
10 |
24 |
=-14
19 |
24 |
(3)原式=
7 |
2 |
8 |
7 |
3 |
4 |
=
3 |
8 |
(4)原式=-24×(-
1 |
2 |
3 |
4 |
1 |
3 |
=12-18+8
=2;
(5)原式=9+(20+8)÷(-3)
=9+28÷(-3)
=9-9
1 |
3 |
=-
1 |
3 |
(6)原式=-8×
9 |
4 |
4 |
9 |
=-8;
(7)原式=10+4×(-5)
=10-20
=-10.
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