解方程9(x-2)^2=4(x+1)^2
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解方程9(x-2)^2=4(x+1)^2
解方程9(x-2)^2=4(x+1)^2
解方程9(x-2)^2=4(x+1)^2
9(x-2)^2=4(x+1)^2
9x²-36x+36=4x²+8x+4
5x²-44x+32=0
(5x-4)(x-8)=0
x1=0.8 x2=8
9(x-2)^2=4(x+1)^2
(3x-6)^2=(2x+2)^2
(3x-6)^2-(2x+2)^2 =0
(x-4)(5x-8)=0
x=4或8/5