解方程3(x-1)²-17(1-x)=28
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解方程3(x-1)²-17(1-x)=28
解方程3(x-1)²-17(1-x)=28
解方程3(x-1)²-17(1-x)=28
3(x-1)²-17(1-x)=28
3x²-6x+3-17+17x=28
3x²+11x-42=0
(3x-7)(x+6)=0
x=7/3或x=-6
3(x-1)²-17(1-x)=28
3(x²-2x+1)-17+17x=28
3x²-6x+3-17+17x-28=0
3x²+11x-42=0
(3x-7)(x+6)=0
解得x1=7/3,x2=-6