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脱式计算.(1)2091-2091÷17(2)(34-34×25)÷15(3)1.28×2.37-2.8×0.237(4)(512+119)×12+719.

题目详情
脱式计算.
(1)2091-2091÷17    
(2)(
3
4
-
3
4
×
2
5
)÷
1
5

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19


3
4
-
3
4
×
2
5
)÷
1
5

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19
3
4
3344
3
4
×
2
5
)÷
1
5

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19
3
4
3344
2
5
)÷
1
5

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19
2
5
2255
1
5

(3)1.28×2.37-2.8×0.237
(4)(
5
12
+
1
19
)×12+
7
19
1
5
1155

5
12
+
1
19
)×12+
7
19
5
12
551212
1
19
)×12+
7
19
1
19
111919
7
19
7
19
771919
▼优质解答
答案和解析
(1)2091-2091÷17,
=2091-123,
=1968;

(2)(
3
4
-
3
4
×
2
5
)÷
1
5

=
3
4
×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
3
4
333444-
3
4
×
2
5
)÷
1
5

=
3
4
×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
3
4
333444×
2
5
)÷
1
5

=
3
4
×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
2
5
222555)÷
1
5

=
3
4
×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
1
5
111555,
=
3
4
×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
3
4
333444×(1-
2
5
)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
2
5
222555)×5,
=
3
4
×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
3
4
333444×
3
5
×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
3
5
333555×5,
=
9
4


(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
9
4
999444;

(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;

(4)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
5
12
555121212+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
1
19
111191919)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
7
19
777191919,
=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
5
12
555121212×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
1
19
111191919×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6.
7
19
777191919,
=5+(
12
19
+
7
19
),
=5+1,
=6.
12
19
121212191919+
7
19
),
=5+1,
=6.
7
19
777191919),
=5+1,
=6.