Question

0.8X*(0.5+0.4)=4.32 解方程

Answer 1

0.8X*(0.5+0.4)=4.32

0.72x=4.32

x=6

x-2分x+1=2+2分x+1

(x+1)/(x-2)=2+(x+1)/2

2x+2=4(x-2)+(x+1)(x-2)

x^2-x-2+4x-8-2x-2=0

x^2+x-12=0

(x+4)(x-3)=0

x=-4或3