题目内容

【题目】脱式计算,能简算的要简算。

2.5×5.18×4 10.1×87

0.38×56+1.2×5.6 [8.3-(3.6+2.9)]÷0.72

【答案】51.8;878.7;

28;2.5

【解析】

2.5×5.18×4

=2.5×4×5.18

=10×5.18

=51.8

10.1×87

=(10+0.1)×87

=10×87+0.1×87

=870+8.7

=878.7

 0.38×56+1.2×5.6

=3.8×5.6+1.2×5.6

=5.6×(3.8+1.2)

=5.6×5

=28  

[8.3-(3.6+2.9)]÷0.72

=[8.3-6.5]÷0.72

=1.8÷0.72=2.5

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