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](/uploads/image/z/5061938-50-8.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%3A4x%28x-4%29%2B21%3D5+%E8%A7%A3%E6%96%B9%E7%A8%8B%3A9x%5E2%3D%282x-5%29%5E2)
: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
再问: 计算:(4x-x^3)/(x+2) (-x^2y^3+4xy^2-4y)/(xy-2) [(2x-1)^2-(x+1)^2]/(x-2) (x^3+x^2-x-1)/(x-1)
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
再问: 计算:(4x-x^3)/(x+2) (-x^2y^3+4xy^2-4y)/(xy-2) [(2x-1)^2-(x+1)^2]/(x-2) (x^3+x^2-x-1)/(x-1)
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
解方程 x(2x-4)+3x(x-1)=5x(x-3)+8
解方程(x-2)/(x-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7)
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3
解方程:4x(x-4)+21=5 解方程:9x^2=(2x-5)^2
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解方程5/(x^-2x)-4/(x^2+2x)=3/x^2-4
解分式方程:4/5x+x/(5x-25)=5/(x^2-5x)
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