解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2

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解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2

解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2
解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2

解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2
:4x(x-4)+21=5
4(x²-4x+4)=0
(x-2)²=0
x=2
9x^2=(2x-5)^2
(3x)²-(2x-5)²=0
(3x+2x-5)(3x-2x+5)=0
5(x-1)(x+5)=0
x=1,x=-5

4x(x-4)+21=5
4x²-16x+16=0
x²-4x+4=0
(x-2)²=0
x=2
9x^2=(2x-5)^2
(3x)²-(2x-5)²=0
(3x+2x-5)(3x-2x+5)=0
(5x-5)(x+5)=0
x=1或x=-5
祝学习进步,望采纳,不...

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4x(x-4)+21=5
4x²-16x+16=0
x²-4x+4=0
(x-2)²=0
x=2
9x^2=(2x-5)^2
(3x)²-(2x-5)²=0
(3x+2x-5)(3x-2x+5)=0
(5x-5)(x+5)=0
x=1或x=-5
祝学习进步,望采纳,不懂的欢迎追问...

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