6(x+y)²-2(x+y)(x-y)
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计算:
6(x+y)²-2(x+y)(x-y)
=6X^2+12XY+6Y^2-2X^2+2Y^2
=4X^2+12XY+8Y^2
分解因式:
6(x+y)²-2(x+y)(x-y)
=2(X+Y)[3(X+Y)-(X-Y)]
=2(X+Y)(2X+4Y)
=4(X+Y)(X+2Y)
3a²-9a²-3a
=-6a^2-3a
(分解因式:-3a(2a+1))
计算:
6(x+y)²-2(x+y)(x-y)
=6X^2+12XY+6Y^2-2X^2+2Y^2
=4X^2+12XY+8Y^2
分解因式:
6(x+y)²-2(x+y)(x-y)
=2(X+Y)[3(X+Y)-(X-Y)]
=2(X+Y)(2X+4Y)
=4(X+Y)(X+2Y)
3a²-9a²-3a
=-6a^2-3a
(分解因式:-3a(2a+1))
追问
打错了,3a三次方-9a²-3a
追答
3a三次方-9a²-3a
=3a(a^2-3a-1)
=3a[(a-3/2)^2-13/4]
=3a(a-3/2+√13/2)(a-3/2-√13/2).
本题只能在实数范围内分解因式,
若有理数范围
3a三次方-9a²-3a
=3a(a^2-3a-1)
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6(x+y)²-2(x+y)(x-y)
=6(x+y)²-2(x²-y²)
=6(x²+2xy+y²)-2x²+2y²
=6x²+12xy+6y²-2x²+2y²
=4x²+12xy+8y²
=6(x+y)²-2(x²-y²)
=6(x²+2xy+y²)-2x²+2y²
=6x²+12xy+6y²-2x²+2y²
=4x²+12xy+8y²
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展开全部
6(x+y)²-2(x+y)(x-y)
=6x²+12xy+6y²-2x²+2y²
=4x²+12xy+8y²
3a²-9a²-3a
=-6a²-3a
=6x²+12xy+6y²-2x²+2y²
=4x²+12xy+8y²
3a²-9a²-3a
=-6a²-3a
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评论
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