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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