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一元二次方程因式分解法
(1)——x^2-2x-99=0 (2)——2y(y-4)=4-y (3)——(x-5)^2+2x(x-5)=0 (4)4(x-√2)^2=3(√2-x)
人气:225 ℃ 时间:2020-02-03 14:15:15
解答
(1) x^2-2x-99=0 x^2-2x+1-100=0(x-1)^2-100=0(x-1)^2=100x1=11 x2=-9(2) 2y(y-4)=4-y2y^2-7y-4=0(x-4)(2x+1)=0x1=4 x2=-0.5(3) (x-5)^2+2x(x-5)=0(x-5)(x-5+2x)=0(x-5)(3x-5)=0x1=5 x2=5/3(4) 4(x-√2)^2=3(√2-x)...
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