题目内容
【题目】用简便方法计算下面各题.
4.26×101﹣4.26
6.79﹣0.25﹣0.75
2.97×30
1.25×32×0.25
【答案】426
5.79
89.1
10
【解析】
4.26×101﹣4.26
=4.26×(101﹣1)
=4.26×100
=426;
6.79﹣0.25﹣0.75
=6.79﹣(0.25+0.75)
=6.79﹣1
=5.79;
2.97×30
=(3﹣0.03)×30
=3×30﹣0.03×30
=90﹣0.9
=89.1;
1.25×32×0.25
=1.25×4×8×0.25
=(1.25×8)×(4×0.25)
=10×1
=10.
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