
1个回答
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(x-2)^2-9(x-1)^2=0
=>(x-2+3x-3)(x-2-3x+3)=0
=>(4x-5)(-2x+1)=0
=>x=5/4或x=1/2
(x-2)^2-9(x-1)^2=0
=>x^2-4x+4-9(x^2-2x+1)=0
=>-8x^2+14x-5=0
=>8x^2-14x+5=0
=>(4x-5)(2x-1)=0
=>x=5/4或x=1/2
=>(x-2+3x-3)(x-2-3x+3)=0
=>(4x-5)(-2x+1)=0
=>x=5/4或x=1/2
(x-2)^2-9(x-1)^2=0
=>x^2-4x+4-9(x^2-2x+1)=0
=>-8x^2+14x-5=0
=>8x^2-14x+5=0
=>(4x-5)(2x-1)=0
=>x=5/4或x=1/2
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