计算：(1)"1/6x-4y"+"1/6x+4y"-"3x/4y^2-9x^2" (2)1-(a- "1/1-a")^2除以"a^2-a+1/a^2-2a+1"

计算：5x-2y-6+ (1/x) + (1/y) 计算：1/6x-4y+1/6x+4y-2y/4y^2-9x^2 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) 已知x平方-6x+9与/y-1/互为相反数,计算(x/y-y/x)÷( x+y) 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 计算1/6x-4y+2/4y^2-9x^2 计算6x³y^6÷(1/2)y³÷(-3x²y)-(12x^4y^6-8x²y^4-16x³y^5)÷4x²y³ 用简便方法计算方程组 x+y-1=0 4(x+y)-6分之1y=5 计算：(1+ y/x-y )·(1- x/x+y) (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-（5x-y）-【6x-（x-3y）-1】-1 计算(x+y-1)^2 计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2 计算4x^1/4(-3x^1/4y^1/3)/（-6x^-1/2y-2/3） 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(4x^2-2x^3+6x)/(-2x)-(x-1)^2y^2-4/y^2-y-6)+(y+2/y-3)/(y+1/y-3) 麻烦你们团队了：计算：1、（6xy^2-12x^3y^4+2x^2y^2)/(-2xy^2) 2、8(x-y)^4(x+y)^3/27[(x+y)(x-y)]^3 计算x(y-1)+1-y