x3-y3和x3+y3怎么因式分解 要详细过程
4个回答
展开全部
X³-Y³=X³-XY²+XY²-Y³
=X(X²-Y²)+Y²(X-Y)
=X(X-Y)(X+Y)+Y²(X-Y)
=(X-Y)[X(X+Y)+Y²]
=(X-Y)(X²+XY+Y²)
X³+Y³=X³+X²Y-X²Y+Y³
= X²(X+Y)-Y(X²-Y²)
=X²(X+Y)-Y(X-Y)(X+Y)
=(X+Y)[X²-Y(X-Y)]
=(X+Y)(X²-XY+Y²)
扩展资料:
相关公式:
(1)(a-b)³=a³-3a²b+3ab²-b³
(a-b)³=a³-3a²b+3ab²-b³的推导过程如下:
(a-b)³
=(a-b)(a-b)²(分解成两个因式相乘)
=(a-b)(a²-2ab+b²)(把(a-b)²用乘法表达出来)
=a³-3a²b+3ab²-b³(依次相乘得到最后结果)
(2)(a+b)³=a³+3a²b+3ab²+b³
(a+b)³
=(a+b)(a+b)²
=(a+b)(a²+b²+2ab)
=a³+3a²b+3ab²+b³
展开全部
X³-Y³=X³-XY²+XY²-Y³
=X(X²-Y²)+Y²(X-Y)
=X(X-Y)(X+Y)+Y²(X-Y)
=(X-Y)[X(X+Y)+Y²]
=(X-Y)(X²+XY+Y²)
X³+Y³=X³+X²Y-X²Y+Y³
= X²(X+Y)-Y(X²-Y²)
=X²(X+Y)-Y(X-Y)(X+Y)
=(X+Y)[X²-Y(X-Y)]
=(X+Y)(X²-XY+Y²)
=X(X²-Y²)+Y²(X-Y)
=X(X-Y)(X+Y)+Y²(X-Y)
=(X-Y)[X(X+Y)+Y²]
=(X-Y)(X²+XY+Y²)
X³+Y³=X³+X²Y-X²Y+Y³
= X²(X+Y)-Y(X²-Y²)
=X²(X+Y)-Y(X-Y)(X+Y)
=(X+Y)[X²-Y(X-Y)]
=(X+Y)(X²-XY+Y²)
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有具体公式
x³-y³=(x-y)(x²+xy+y²)
x³+y³=(x+y)(x²-xy+y²)
x³-y³=(x-y)(x²+xy+y²)
x³+y³=(x+y)(x²-xy+y²)
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3(x-y) 3(x+y)
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