把下列加法式子转化成乘法式子.①120+120+120+120+120= × ;②200+220+240+260= × .
= : =27÷ =.
÷2== 折= %=0.75.
3:8= ÷ =.
:10=0.2= ÷25= %
÷8=12: =0.75== <填百分数>