(x+y)^2+3(x^2-y^2)+2(x+y)x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,
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(x+y)^2+3(x^2-y^2)+2(x+y)x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,(x+y)^2+3(x^2-y^2)+2(x+y)x加y的平方,加上x的平方
(x+y)^2+3(x^2-y^2)+2(x+y)x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,
(x+y)^2+3(x^2-y^2)+2(x+y)
x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,
(x+y)^2+3(x^2-y^2)+2(x+y)x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,
(x+y)²+3(x²-y²)+2(x+y)
=(x+y)²+3(x+y)(x-y)+2(x+y)
=(x+y)[x+y+3(x-y)+2]
=(x+y)(4x-2y+2)
=2(x+y)(2x-y+1)
点拨:x²-y² 应用平方差公式,化为(x+y)(x-y)
再提取每一项公有的(x+y),运用乘法分配律
最后提取(4x-2y+2)中的2,得2(2x-y+1)
(x+y)^2+3(x^2-y^2)+2(x+y)
=(x+y)^2+3(x+y)(x-y)+2(x+y)
=(x+y)^2+(x+y)(3x-3y)+2(x+y)
=(x+y)^2+(x+y)(3x-3y+2)
=(x+y)(x+y+3x-3y+2)
=(x+y)(4x-2y+2)
=2(x+y)(2x-y+1)
= (X+Y)的平方+3(X的平方-Y的平方+2XY)-3XY+2(X+Y)
= (X+Y)的平方+3(X+Y)的平方-3XY+2(X+Y)
在往下就一步一步做就行了
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2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
化简y(x+y)+(x+y)(x-y)-x^2