Question

﹙2又5/9+2又5/9+2又5/9﹚×0.25简便计算 解方程1/8X﹙X+0.5﹚＝75％

Answer 1

1.﹙2又5/9+2又5/9+2又5/9﹚×0.25=(2又5/9)*3*1/4=69/36=23/12

2.1/8X﹙X+0.5﹚＝75％

1/8x*x+1/16x-3/4=0

2x*x+x-12=0

x=(-1±√97)/4