[﹙3x+4y﹚-3x﹙3x+4y﹚]÷﹙-6y﹚,其中x=﹣1,y=3.
﹣2x-﹛4x-2y-[3x-﹙2y+1﹚]﹜,其中x=﹣3分之2,y=2008
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
[3﹙x-y﹚^4 ﹙x+y﹚^5 -6﹙x-y﹚^3 ﹙x+y﹚^4 ]÷[3﹙x-y﹚²﹙x+y﹚
1.先化简,再求值:[(3X+4Y)^2 -3X(3X+4Y)]÷(-6Y),其中X=-1,Y=3.
3x²-3﹙6x+4y﹚-2[x³+3﹙3x-2y﹚]其中x=1/5,y=3/4
4x²-2x²-﹙5x²-3x²+二分之三x-y-1﹚其中x=3 y=1先化简再
化简求值:(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y