(x+5y)(x+4y)-(x-y)(x+y),其中,x=-二又三分之二,y=七分之三
(x+5y)(x+4y)-(x-y)(x+y),其中,x=-二又三分之二,y=七分之三
(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x=2分之七,y=-2分之5
已知:x=五又七分之四,y=四又七分之三,求代数式[(-3-1/2)(x+y)]^3 * (x-y) * [-2(x-y
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
已知:x=五又七分之四,y=四又七分之三,求代数式[-三又二分之一(x+y)]^3×(x-y)×[-8(x-y)(x+y
已知:x=五又七分之四,y=四又七分之三,求代数式[-三又二分之一(x+y)]^3×(x-y)×[-2(x-y)(x+y
已知4x+y-4x-6y+10=0,求(三分之二x√9x+y√y分之x)-x√x分之1-5x√x分之y)的值
先化简,后求值(x+5y)(x+4y)-(x-y)(x+y),其中,x等于负2又3分之2,y等于7分之3
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
解方程十八分之七(x+y)=1,四分之三x+九分之七(x+y)=5
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7