Question

x(2x-5)=4x-10,要用配方法啊,不要因式分解法!

Answer 1

x(2x-5)=4x-10

2x²-5x-4x=-10

2x²-9x=-10

x²-9/2*x=-5

x²-9/2*x+81/16=-5+81/16

(x-9/4)²=1/16

所以x-9/4=±1/4

所以x=2,或x=5/2

望采纳