计算(要过程):Y+ (—2Y+2)—(3Y+3) 7X—(6X—5Y)—2Y 3X²—【7X—(6X—8)—
计算(要过程):Y+ (—2Y+2)—(3Y+3) 7X—(6X—5Y)—2Y 3X²—【7X—(6X—8)—
计算:(x—y)^7÷(y—x)^6+(—x—y)^3÷(x+y)^2
计算[(3x——2y)(3x+2y)—(x+2y)(5x—2y)]除以4x
(x+y)^5+2(-x—y)^3·(x+y)²;
先化简再求值 :[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x=—2,y=5
计算x—4y分之3x+4y4y—x分之x+y—x—4y分之7y得( )
解方程组X+Y除以2+X—Y除以3=6和4(X+Y)—5(X—Y)=2
解方程组(X+Y)/2+(X—Y)/3=6和4(X+Y)-5(X-Y)=2
计算1/6x-4y +1/6x+4y — 3x/4y^2-9x^2
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组