题目内容

【题目】脱式计算,能简算的要简算。

0.49÷3.5+1.26×0.45       2.5×5.49×0.4

[24.7-(8.75+7.15)]×12 5.4×4.08+4.6×4.08

【答案】0.707;5.49;

105.6;40.8

【解析】

0.49÷3.5+1.26×0.45

=0.14+0.567

=0.707 

2.5×5.49×0.4

=2.5×0.4×5.49

=1×5.49

=5.49

24.7-(8.75+7.15)]×12

=[24.7-15.9]×12

=8.8×12

=105.6  

5.4×4.08+4.6×4.08

=(5.4+4.6)×4.08

=10×4.08

=40.8

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