17乘以13-23乘以6-23怎样简便法

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17乘以13-23乘以6-23怎样简便法17乘以13-23乘以6-23怎样简便法17乘以13-23乘以6-23怎样简便法17×13-23×6-23=17×13-23×(6+1)=17×13-(13+1

17乘以13-23乘以6-23怎样简便法
17乘以13-23乘以6-23怎样简便法

17乘以13-23乘以6-23怎样简便法
17×13-23×6-23
=17×13-23×(6+1)
=17×13-(13+10)×7
=17×13-13×7-10×7
=13×(17-7)-70
=130-70
=60

=17*(23-10)-23*(6+1)
=17*23-7*23-17*10
=(17-7)*23-170
=230-170
=60