解方程.(1)3y²+6y-4=0 (2)x²+4x-9=2x-11 (3)x(x+4)=8x+12
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![解方程.(1)3y²+6y-4=0 (2)x²+4x-9=2x-11 (3)x(x+4)=8x+12](/uploads/image/z/329549-5-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B.%281%293y%26%23178%3B%2B6y-4%3D0+%282%29x%26%23178%3B%2B4x-9%3D2x-11+%283%29x%28x%2B4%29%3D8x%2B12)
解方程.(1)3y²+6y-4=0 (2)x²+4x-9=2x-11 (3)x(x+4)=8x+12
解方程.(1)3y²+6y-4=0 (2)x²+4x-9=2x-11 (3)x(x+4)=8x+12
解方程.(1)3y²+6y-4=0 (2)x²+4x-9=2x-11 (3)x(x+4)=8x+12
(1)3y²+6y-4=0
y²+2y=4/3
y²+2y+1=7/3
(y+1)²=7/3
y=-1+√21/3 y=-1-√21/3
(2)x²+4x-9=2x-11
x²+2x+1=-1
(x+1)²=-1
无解
(3)x(x+4)=8x+12
x²-4x-12=0
(x-6)(x+2)=0
x=6 x=-2