简便计算126乘以81减去81

126*81-81
=126*81-81*1
=81*(126-1)
=125*(80+1)
=80*125+125
=125*80+125
=10000+125
=10125
也可以
126 * 81 - 81
= 126 * 81 - 1 * 81
= (126 - 1) * 81
= 125 * 81
= 125 * (80 + 1)
= 125 * 80 + 125
= 250 * 40 + 125
= 500 * 20 + 125
= 1000 * 10 + 125
= 10000 + 125
= 10125
用乘法分配律
求采纳

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