2/1(8x-6y)+3(y-3/x)
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把(x-y),(a+b)作为一个因式,合并同类项:3(x-y)-9(x-y)-8(x-y)+6(x-y)-1
把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
2/1(8x-6y)+3(y-3/x)
化简((X-2Y)的平方+(X-Y)(x+Y)-2(X-3Y)(X-Y))除以Y
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^2
先化简再求值 [(x-y)²+(x+y)(x-y)]÷2x,其中x=3,y=1
先化简再求值:-3(2x-y)-{7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)}已知x=-1/5,y=-5
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'y=5;x=14;y=((x=3*y,x+6),x-1);printf(''x=%d,y=%d'',x,y);
1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003
已知x+y=-2,试计算1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y的值
已知X=11Y,(X-2)*3=Y,(X-4)*5=Y,(X-6)*7=Y,(X-8)*9=Y ,求X、Y各是多少?
1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/(x^2-5x+6)+(x^2-3x+8)/(x^2-4x+3)2.{(x^2)/(x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{(x^2/x^2+y^2)^2}
(y-x)^4(x-y)^3+2(x-y)^6(y-x)
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
求这道计算题哪里出错.4x=-6y,等式两边都减去2x-3y,得4x-(2x-3y)=-6y-(2x-3y),所以 2x+3y=-3y-2x,两边都处以2x+3y,得(2x+3y )除以2x+3y=(-3y-2x )除以2x+3y,整理后得1=-1
(1)3x+4y=3.6 (2)4x+10y=3.6 (3)x+2y=9 5x-10y=8 15x-10y=8 3x-2y=﹣1(1)3x+4y=3.6 5x-6y=8 (2)4x+10y=3.6 15x-10y (3)x+2y=9 3x-2y=﹣1
计算:1.(x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y)1.(x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y)