(x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y) )RT这才是对的!(x+2y)(3*x^2+4*y^2)-(x+2y)^2 *(x-2y)
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(x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y))RT这才是对的!(x+2y)(3*x^2+4*y^2)-(x+2y)^2*(x-2y)(x+2y)(3x^2+4y^2)-(x+2y)
(x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y) )RT这才是对的!(x+2y)(3*x^2+4*y^2)-(x+2y)^2 *(x-2y)
(x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y) )
RT
这才是对的!
(x+2y)(3*x^2+4*y^2)-(x+2y)^2 *(x-2y)
(x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y) )RT这才是对的!(x+2y)(3*x^2+4*y^2)-(x+2y)^2 *(x-2y)
是分解因式嘛
(x+2y)(3x²+4y²)-(x+2y)² ×(x+2y)
=(x+2y)[(3x²+4y²)-(x+2y)²]
=(x+2y)[3x²+4y²-(x²+4xy+y²)]
=(x+2y)(3x²+4y²-x²-4xy-4y²)
=(x+2y)(2x²-4xy)
=2x³-4x²y+4x²y-8xy²
=2x³-8xy²
=2x(x²-4y²)
=2x(x-2y)(x+2y)
不明白题意