解方程： x+7.6=28.9 x-12.56=15.7 x÷3.14=8

x+7.6=28.9 x=28.9-7.6 x=21.3 x-12.56=15.7 x=15.7+12.56 x=28.26 x÷3.14=8 x=8*3.14 x=25.12本回答被提问者采纳