135*27+135*27+135
=135*(27+27+1)
=135*55
=(140-5) * (50+5)
=140*50+140*5-5*50-5*5
=7000+700-250-25
=7700-250-25
=7450-25
=7425
135*27+135*27+135怎么简便运算
135*27+135*27+135
=135*(27+27+1)
=135*55
=(140-5) * (50+5)
=140*50+140*5-5*50-5*5
=7000+700-250-25
=7700-250-25
=7450-25
=7425