题目内容
【题目】用自己喜欢的方法计算.
5.6×0.7+0.2×5.6+0.56 | 0.9+99×0.9 | 89×[34﹣(716﹣14)] |
720﹣800÷16 | [12﹣(34﹣35 )]÷710 | 8.5÷[(1+0.5)×5] |
【答案】解:①5.6×0.7+0.2×5.6+0.56 =0.56×7+2×0.56+0.56×1
=0.56×(7+2+1)
=0.56×10
=5.6;
②0.9+99×0.9
=0.9×(99+1)
=0.9×100
=90;
③89×[34﹣(716﹣14 )]
=89×[34﹣702]
=89×(﹣668)
=﹣59452;
④720﹣800÷16
=720﹣50
=670;
⑤[12﹣(34﹣35 )]÷710
=[12﹣34+35]÷710
=[12+35﹣34]÷710
=13÷710
= ;
⑥8.5÷[(1+0.5)×5]
=8.5÷[1.5×5]
=8.5÷7.5
= .
【解析】①根据乘法分配律进行计算即可;②根据乘法分配律进行计算即可;③先算小括号里的减法,再算中括号里的减法,最后算乘法;④先算除法,再算减法;⑤根据加法交换律进行计算即可;⑥先算小括号里的加法,再算乘法,最后算除法.
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0.77+0.33= | (0.18+0.9)÷9= | 2× ÷2× = | 5.2﹣4= | 13÷2÷13= |
7÷1.4= | 1.68+1.5= | ( + )×8= |