设这个数为x,列方程式0.7x+0.8÷0.36=100.7x=10-0.8÷0.360.7x=10-20/90.7x=70/9x=100/9
70℅x+0.36÷0.8=100.7x=10-0.450.7x=9.55x≈13.64
70%x十0.8/0.36=10
70%x+0.36/0.8=100.7x=10-0.45x=9.55/0.7x=13.64
题目对吗?70%X+0.8÷0.36=1070%X+20/9=107/10X=10-20/9X=100/9