问题 解答题
脱式计算,能简便的简便.
4.2-1.38+5.8-3.620.125×0.25×32
2÷
2
3
-
2
3
÷2
3
3
5
×2.65-3
3
5
+3
3
5
×8.35
答案

(1)4.2-1.38+5.8-3.62,

=4.2+5.8-(1.38+3.62),

=10-5,

=5;

(2)0.125×0.25×32,

=(0.125×8)×(0.25×4),

=1×1,

=1;

(3)2÷

2
3
-
2
3
÷2,

=2×

3
2
-
2
3
×
1
2

=3-

1
3

=2

2
3

(4)3

3
5
×2.65-3
3
5
+3
3
5
×8.35

=3.6×(2.65+8.35-1),

=3.6×10,

=36.

单项选择题
单项选择题