2x加y减1的和的平方,跪求

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2x加y减1的和的平方,跪求
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2x加y减1的和的平方,跪求
2x加y减1的和的平方,跪求

2x加y减1的和的平方,跪求
﹙2x+y-1﹚²
=[﹙2x+y﹚-1]²
=﹙2x+y﹚²-2﹙x+y﹚+1
=4x²+4xy+y²-2x-2y+1

2x加y减1的和的平方
=4x²+4x(y-1)+(y-1)²
=4x²+4xy-4x+y²-2y+1

2x加y减1的和的平方
=4x²+4x(y-1)+(y-1)²
=4x²+4xy-4x+y²-2y+1

答:[2x+(y-1)]²
=4x²+4x(y-1)+(y-1)²
=4x²+4xy-4x+y²-2y+1

祝你开心,希望对你有帮助

4x的平方加4xy减4x加y的平方减2y加1

(2x+y-1)^2
=[2x+(y-1)]^2
=4x^2+(y-1)^2+4xy-4x
=4x^2+y^2-2y+1+4xy-4x