Question

分式计算（x-2分之3x-x+2分之x）除以x²-4分之2x,其中x=3？

Answer 1

2a(x-y)+8b(y-x)+14c(x-y)
=2a(x-y)-8b(x-y)+14c(x-y)
=2(x-y)(a-4b+7c)
81x^4-18x^2+1
=81x^4-9x²-9x²+1
=9x²(9x²-1)-(9x²-1)
=(9x²-1)(9x²-1)
=(9x²-1)²
=(3x+1)²(3x-1)²,1,原式={[3x(x+2)-x(x-2)]/(x+2)(x-2)}÷[2x/(x²-4)]
=[(3x²+6x-x²+2x)/(x²-4)]×[(x²-4)/2x]
=[(2x²+8x)/(x²-4)]×[(x²-4)/2x]
=2x(x+4)/2x
=x+4
=3+4
=7,1,