方程54x-78x=-20 8x-8x=-2 2x

方程54x-78x=-20 8x-8x=-2 2x-8x=0 -2x+3x=8 7x+13x=-6怎么用因式分解法解

2个回答

(1)54x-78x=-20 ,27x^2-39x+10=0,(3x-1)(9x-10)=0,x=1/3,x=9/10 (2)8x^2-8x+2=0,4x^2-4x+1=0,(2x-1)^2=0,x=1/2 (3)2x^2-8x=0,2x(x-4)=0,x=0,x=2 (4)7x^2+13x+6=0,(x+1)(7x+6)=0,x=-1,x=-6/7