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一元两次方程,用因式分解法
(1)2x²-3X-14=o
(2)3(X-5)²=2(5-x)
(3)22y²-49y-15=0
人气:432 ℃ 时间:2020-03-26 15:47:29
解答
(1)2x²-3X-14=o(2x-7)(x+2)=02x-7=0 x=7/2x+2=0 x=-2(2)3(X-5)²=2(5-x)3(x-5)²-2(5-x)=03(x-5)²+2(x-5)=0(x-5)[3(x-5)+2]=0(x-5)(3x-15+2)=0(x-5)(3x-13)=0x-5=0 x=53x-13=0 x=13/3(...
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