Question

解方程。

(1) 75%x+25%x=6 (2)4x+20%x =13.86 (3) 60%x-35%x=75 (4) x: 15=6:3

Answer 1

(1)       75%x+25%x=6   解：(75％+25％)x=6                     100％x=6                               x=6 (2)  4x+20%x =13.86   解：4x+0.2x=13.86                 4.2x=13.86                      x=3.3 (3) 60%x-35%x=75 解：       25％x=75                        x=300 (4) x: 15=6:3 解： 3x=15×6          3x=90            x=30