题目内容

【题目】我是巧算小神仙。

83×0.25×4;  6.8×4.1+5.9×6.8;   215﹣42.17﹣57.83;

25×99;   8.941×99+8.941;  0.73×101

【答案】83;68;115;

2475;894.1;73.73

【解析】

83×0.25×4

=83×(0.25×4)

=83×1

=83;

6.8×4.1+5.9×6.8

=6.8×(4.1+5.9)

=6.8×10

=68;

215﹣42.17﹣57.83

=215﹣(42.17+57.83)

=215﹣100

=115;

25×99

=25×(100﹣1)

=25×100﹣1×25

=2500﹣25

=2475;

8.941×99+8.941

=8.941×(99+1)

=8.941×100

=894.1;

0.73×101

=0.73×100+0.73×1

=73+0.73

=73.73

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