分式计算题[3x/(x-2)-x/(x+2)] × (x²-4)/x

2022-09-24 悬赏7金币 已收到1个回答
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[3x/(x-2)-x/(x+2)] × (x²-4)/x
=[3x(x+2)/(x-2)(x+2)-x(x-2)/(x+2)(x-2)]× [(x²-4)/x]
={[3x(x+2)-x(x-2)]/(x²-4)}× [(x²-4)/x ]
=3(x+2)-(x-2)
=2x+8
19
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