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0.125×72简便计算3.2×2.5简便计算0.93×99简便计算70.1×9.9简便计算0.93＋9.9简便计算6.4×（0.125＋12.5）简便计算
题目详情
0.125×72简便计算 3.2×2.5简便计算 0.93×99简便计算 70.1×9.9简便计算 0.93＋9.9简便计算
6.4×（0.125＋12.5）简便计算
6.4×（0.125＋12.5）简便计算
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答案和解析
解
0.125×72
=0.125×8×9
=1×9
=9
3.2×2.5
=8×0.4×2.5
=8×1
=8
0.93×99
=0.93×(100-1)
=0.93×100-0.93×1
=93-0.93
=92.07
70.1×9.9
=70.1×(10-0.1)
=70.1×10-70.1×0.1
=701-7.01
=693.99
0.93+9.9
=(1-0.1)+0.93
=(1+0.93)-0.1
=1.93-0.1
=1.83
6.4×(0.125+12.5)
=6.4×0.125+6.4×12.5
=0.8×8×0.125+8×0.8×12.5
=0.8×1+8×1
=8+0.8
=8.8
0.125×72
=0.125×8×9
=1×9
=9
3.2×2.5
=8×0.4×2.5
=8×1
=8
0.93×99
=0.93×(100-1)
=0.93×100-0.93×1
=93-0.93
=92.07
70.1×9.9
=70.1×(10-0.1)
=70.1×10-70.1×0.1
=701-7.01
=693.99
0.93+9.9
=(1-0.1)+0.93
=(1+0.93)-0.1
=1.93-0.1
=1.83
6.4×(0.125+12.5)
=6.4×0.125+6.4×12.5
=0.8×8×0.125+8×0.8×12.5
=0.8×1+8×1
=8+0.8
=8.8
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