问题 解答题
用你喜欢的方法计算
12.5×32×0.8
4
9
-
3
10
+
1
3
2.5×[(3.2+1.8)÷0.25]6.4×0.09+0.01×6.4.
答案

①12.5×32×0.8,

=(12.5×8)×(4×0.8),

=100×3.2,

=320;

4
9
-
3
10
+
1
3

=

40
90
-
27
90
+
30
90

=

43
90

③2.5×[(3.2+1.8)÷0.25],

=2.5×[5÷0.25],

=2.5×20,

=50;

④6.4×0.09+0.01×6.4

=6.4×(0.09+0.01),

=6.4×0.1,

=0.64.

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