(7/5+1/10)x20=(7/5)x20+(1/10)x20=7x(20÷5)+20÷10=28+2=30
(7/5+1/10)x20=7/5x20+1/10x20=7x4+2=28+2=30谢谢,请采纳
(7/5+1/10)x20=7/5x20+1/10x20=28+2=30希望能帮到你