计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)

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计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)

计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)
计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)

计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)
原式=[3x/(x-2)-x/(x+2)]·((x-2)(x+2)/x)
=3(x+2)-(x-2)
=2x+8

2X^5-8X^4-8X^3-32X^2

先让括号内分母通分。。。
原式=[3X(X+2)-X(X-2)]/(X²-4)·[(X²-4)/X]
=(2X²+8X)/X
=2X+8