【数学计算题】化简【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)【数学计算题】化简【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)因式分解49(x-y)²-9(y+x)²x^4-y^4(x+y)²-16(x-y)²
问题描述:
【数学计算题】化简【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)
【数学计算题】
化简
【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)
因式分解
49(x-y)²-9(y+x)²
x^4-y^4
(x+y)²-16(x-y)²
答
【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)
=x/(x-1)²-1/(x-1)÷2/(x²-1)
=1/(x-1)²÷2/(x²-1)
=1/(x-1)²*(x²-1)/2
=(x+1)/2(x-1)
49(x-y)²-9(y+x)²
=(7x-7y)²-(3x+3y)²
=[(7x-7y)+(3x+3y)]*[﹙7x-7y)-(3x+3y)]
=﹙10x-4y﹚*(4x-10y)
x^4-y^4
=﹙x²﹢y²﹚*﹙x²-y²﹚
=(x²+y²)*(x+y)*(x-y)
(x+y)²-16(x-y)²
=[(x+y)+(4x-4y)]*[(x+y)-(4x-4y)]
=(5x-3y)(5y-3x)
答
【x/(x²-2x+1)+1/(1-x)】÷2/(x²-1)﹦【x/(x-1)²-1/(x-1)】÷2/(x²-1)﹦【x/(x-1)²-(x-1)/(x-1)²】÷2/(x²-1)﹦【1/(x-1)²】×【(x²-1)/2...