9(x+y)的平方-6(x+y)+1

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9(x+y)的平方-6(x+y)+19(x+y)的平方-6(x+y)+19(x+y)的平方-6(x+y)+19(x+y)²-6(x+y)+1=[3(x+y)]²-2×3(x+y)×

9(x+y)的平方-6(x+y)+1
9(x+y)的平方-6(x+y)+1

9(x+y)的平方-6(x+y)+1
9(x+y)²-6(x+y)+1
=[3(x+y)]²-2×3(x+y)×1+1²
=[3(x+y)-1]²
=(3x-3y-1)²

9(x+y)的平方-6(x+y)+1
=[3(x+y)-1]²
=(3x+3y-1)²

9(x+y)²-6(x+y)+1
=[3(x+y)]²-2×3(x+y)×1+1²
=[3(x+y)-1]²
=(3x-3y-1)²

9(x+y)的平方-6(x+y)+1
=[3(x+y)]^2-2×3(x+y)+1^2
=(3x+3y-1)^2

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原式=9(x²+y²+2xy)-6(x+y)+1
=9x²+9y²+18xy-6x-6y+1