3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简

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3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简原式=[

3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简
3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简

3(Y+1)^2-5(Y+1)(Y-1)+2(Y-1)^2,化简
原式=[3(Y+1)-2(Y-1)][(Y+1)-(Y-1)]=(3Y+3-2Y+2)(Y+1-Y+1)=2(Y+5)

3(y+1)2-5(y+1)(y-1)+2(y-1)2
=3y²+6y+3-5y²+5+2y²-4y+2
=2y+5