55*66+6677+77*88*99怎么简便运算
问题描述:
55*66+6677+77*88*99怎么简便运算
答
55*66+6677+77*88*99
=11*5*11*6+11*100*6+11*7+11*7*8*11*11*9
=121*30+11*607+121*56*99
=121*(30+56*99)+11*607
=121*(30+5600-56)+11*607
=121*5574+11*607
=11(11*5574+607)
=11(55740+5574+607)
=11*61918
=681098