数学分式计算
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1、=[(x+1)(x-1)/(x-1)² -(x-1)/(x+1)]×x/(x-1)
=[(x+1)/(x-1)-(x-1)/(x+1)]×x/(x-1)
=4x/(x+1)(x-1) ×x/(x-1)
=4x²/(x+1)(x-1)²
2、[x(x-3)-(x-4)]/(x-3)×(x-3)/(x+2)(x-2)
=(x²-4x+4)/(x+2)(x-2)
=(x-2)²/(x+2)(x-2)
=(x-2)/(x+2)
=[(x+1)/(x-1)-(x-1)/(x+1)]×x/(x-1)
=4x/(x+1)(x-1) ×x/(x-1)
=4x²/(x+1)(x-1)²
2、[x(x-3)-(x-4)]/(x-3)×(x-3)/(x+2)(x-2)
=(x²-4x+4)/(x+2)(x-2)
=(x-2)²/(x+2)(x-2)
=(x-2)/(x+2)
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