计算(2x)^-4+(4x^2)^-2 xy(x^-1+y^-1)
通分计算:(1)2x-3/(x-1)(x-4) - x-2/(1-x)(4-x) (2)x平方-y平方/xy - xy-
计算:(x-2y)(1+x+2y+4y^2+2xy+x^2)
计算(2x)^-4+(4x^2)^-2 xy(x^-1+y^-1)
计算3xy[2xy-x(y-2)+x-1]
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算(1)(-2x^2)^5/(-x^3)^3+(2x)^4(2)【5xy^2(x^2-3xy)-(-3x^2y^2)^
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
(x^2+xy/x-y)/(xy/x-y)计算
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:(1)x-y分之2x的平方-y-x分之x的平方-4xy+x-y分之2y的平方-x的平方
计算(1)(xy)^3·3x^2·(-4x^2y^3)^2
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)