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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)(
1
4
+
1
6
-
1
3
)×48
(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)(
1
4
+
1
6
-
1
3
)×48
=
1
4
×48+
1
6
×48-
1
3
×48
=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.