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脱式计算.(能简算的要简算,并写出主要的简便过程)(1)3.58-2.36+1.42-2.64(2)(14+16-13)×48(3)3998+85÷5×37(4)12.5×3.2×14.
题目详情
脱式计算.(能简算的要简算,并写出主要的简便过程)
(1)3.58-2.36+1.42-2.64
(2)(
+
-
)×48
(3)3998+85÷5×37
(4)12.5×3.2×
.
(1)3.58-2.36+1.42-2.64
(2)(
1 |
4 |
1 |
6 |
1 |
3 |
(3)3998+85÷5×37
(4)12.5×3.2×
1 |
4 |
▼优质解答
答案和解析
(1)3.58-2.36+1.42-2.64
=(3.58+1.42)-(2.36+2.64)
=5-5
=0;
(2)(
+
-
)×48
=
×48+
×48-
×48
=12+8-16
=4;
(3)3998+85÷5×37
=3998+17×37
=3998+629
=4627;
(4)12.5×3.2×
=12.5×(0.8×4)×
=(12.5×0.8)×(4×
)
=10×1
=10.
=(3.58+1.42)-(2.36+2.64)
=5-5
=0;
(2)(
1 |
4 |
1 |
6 |
1 |
3 |
=
1 |
4 |
1 |
6 |
1 |
3 |
=12+8-16
=4;
(3)3998+85÷5×37
=3998+17×37
=3998+629
=4627;
(4)12.5×3.2×
1 |
4 |
=12.5×(0.8×4)×
1 |
4 |
=(12.5×0.8)×(4×
1 |
4 |
=10×1
=10.
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