1.(x-5)^2+2(x-5)+1=02.9(x-1)^2-4(x+2)^2=0
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1.(x-5)^2+2(x-5)+1=02.9(x-1)^2-4(x+2)^2=01.(x-5)^2+2(x-5)+1=02.9(x-1)^2-4(x+2)^2=01.(x-5)^2+2(x-5)+1
1.(x-5)^2+2(x-5)+1=02.9(x-1)^2-4(x+2)^2=0
1.(x-5)^2+2(x-5)+1=0
2.9(x-1)^2-4(x+2)^2=0
1.(x-5)^2+2(x-5)+1=02.9(x-1)^2-4(x+2)^2=0
.(x-5)^2+2(x-5)+1=0
(x-5+1)^2=0
(x-4)^2=0
x=4
.9(x-1)^2-4(x+2)^2=0
[3(x-1)+2(x+2)][3(x-1)-2(x+2)]=0
(5x+1)(x-7)=0
x=-1/5 或 x=7
1.x^2-x-202.(x-4)(x+5)=4-x3.x^2+6x-5=04.2x^2-4x-1=0
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(2x-2)(x-1)=0 x(x-5)=5x-10
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