解下列方程 (1)x눀-6x-18=0 (2)x눀+2(x-1)=0 (3)x눀-2x-35=0 (4)7x(5x+2)=6x(5x+2)

2024-12-27 07:50:17
推荐回答(1个)
回答1:

(1)
x²-6x-18=0
x²-6x-9-9=0
(x-3)²=9
x-3=3 或x-3=-3
x=6 或x=0
(2)
x²+2(x-1)=0
x²+2x-2=0
(x-1)²=0
x-1=0
x=1
(3)
x²-2x-35=0
x²-2x-1-34=0
(x-1)²=34

(4)
7x(5x+2)=6x(5x+2)
7x(5x+2)-6x(5x+2)=0
(5x+2)(7x-6x)=0
x(5x+2)=0
x=0