已知x+y分之2x-y=2,求代数式x+y分之4x-2x-y分之4x+4y的值
问题描述:
已知x+y分之2x-y=2,求代数式x+y分之4x-2x-y分之4x+4y的值
答
x+y分之4x-2y-2x-y分之4x+4y
=2(2x-y)/(x+y)-4(x+y)/(2x-y)
=2*2-4*(1/2)
=4-2
=2