Question

6.6加0.6乘20加0.6乘19怎么简便,就有赏悬金哦)

Answer 1

88837042

6.6+0.6×20+0.6×19

=0.6×11+0.6×20+0.6×19

=0.6×(11+20+19)

=0.6×50

=30