解方程. 60%x-40%x=4.5 x+x
解方程. 60%x-40%x=4.5 x+x
日期:2016-07-12 06:00:53 人气:1
①60%x-40%x=4.5, (60%-40%)x=4.5, 20%x=4.5, 20%x÷20%=4.5÷20%, x=22.5; ②x+x5=4.5,(x+x5)×5=4.5×5, 5x+x=22.5, 6x=22.5, 6x÷6=22.5÷6, x=3.75; ③50-6x=8,50-6x+6x=8+6x, 50=8+6x, 6x+8-8=50-8, 6x=42