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2(x-1)(x+1)+6(x-1)(x+1)=7(x-1)(x+1)求解答,
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2(x-1)(x+1)+6(x-1)(x+1)=7(x-1)(x+1)
2(x²-1)+6(x²-1)=7(x²-1)
8(x²-1)=7(x²-1)
x²-1=0
x=±1
2(x²-1)+6(x²-1)=7(x²-1)
8(x²-1)=7(x²-1)
x²-1=0
x=±1
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