计算：5x-2y-6+ (1/x) + (1/y)

计算：5x-2y-6+ (1/x) + (1/y) 计算 （x-2y)^6÷（2y-x)^5 计算:(x-y)^2*(y-x)^2*(x-y)^6 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y) 计算：(x-5y)^2 计算(x+y-1)^2 计算：x(x-3y)(5x-2y) 计算:2/x+1/(x-y) 计算：1.（x-3y)(-6x) 化简：1.x(x-1)+2x(x+1)-3x(2x-5) (计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18 求紧急计算!乘法公式练习题!求紧急计算!乘法公式练习题!a(a-5)-(a+6)(a-6)(x+y)(x-y)-x(x+y)3(2x+1)(2x-1-2(3x+2)(2-3x)(2x-3y)(3y+2x)-(4y-3x)(3x+4y) 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 (1)计算：a-(a^2)/(a+1)-1 (2)计算：3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)(3)计算：x(2-1/x)+x/x^2-2x*(x^2-4)(4)计算：(x-3)/(2x-4)÷(5/x-2--2)(5)计算：m/m+3-6/9-m^2÷2/m-3(6)计算：(3a/a-3-a/a+3)*a^2-9/a 计算2x/x-y 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 [(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)计算