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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