计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y²/2x+y÷(4x²-y²)
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计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y²/2x+y÷(4x²-y²)
计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y²/2x+y÷(4x²-y²)
计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y²/2x+y÷(4x²-y²)
a-b/a+b*a四次方-a²b²/a²-ab
=(a-b)/(a+b) × a²(a+b)(a-b)/a(a-b)
=a(a-b)
=a²-ab
4x²-4xy+y²/2x+y÷(4x²-y²)
=(2x-y)²/(2x+y)*1/(2x+y)(2x-y)
=(2x-y)/(2x+y)²
=(2x-y)/(4x²+4xy+y²)