1.25(x-2)^2=4 2.x^2-x-20=0 3.9x^2-6x+1=(x-1)^2 4.(x+1)^2-3(x+1)+2_数学解答

1.25(x-2)^2=4 2.x^2-x-20=0 3.9x^2-6x+1=(x-1)^2 4.(x+1)^2-3(x+1)+2=0 5.3(x-2)^2-2(2-x)=0

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解答

1.5(x-2)=±2,则x=2.4或x=1.6 2.(x+4)(x-5)=0,则x=-4或x=5 3.(3x-1)²=(x-1)^2,则3x-1=±(x-1),则x=0或x=0.54.(x+1-2)(x+1-1)=0,则x=1或x=0 5.[3(x-2)+2](x-2)=0,则x=4/3或x=2