-(-1/3x+y)+(1/6x-y)(a^3b-3a^2b^2+2ab^3)/(-1/2ab)(x-1)(2x+3)(2a+b+1)(2a+b-1)
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-(-1/3x+y)+(1/6x-y)(a^3b-3a^2b^2+2ab^3)/(-1/2ab)(x-1)(2x+3)(2a+b+1)(2a+b-1)
-(-1/3x+y)+(1/6x-y)
(a^3b-3a^2b^2+2ab^3)/(-1/2ab)
(x-1)(2x+3)
(2a+b+1)(2a+b-1)
-(-1/3x+y)+(1/6x-y)(a^3b-3a^2b^2+2ab^3)/(-1/2ab)(x-1)(2x+3)(2a+b+1)(2a+b-1)
1,x/3-y+x/6-y=x/2-2y
2,上面提出ab,然后和分母约去ab得:
-2(a^2-3ab-2b^2)
3,直接乘出来:2x^2+3x-2x-3=2x^2+x-3
4,平方差公式:(2a+b)^2-1=4a^2+4ab+b^2-1
楼上2题-2b^2是+2b^2
-(-1/3x+y)+(1/6x-y)
=1/3 x-y+1/6 x-y
=1/2 x-2y
(a^3b-3a^2b^2+2ab^3)/(-1/2ab)
=-2a^2+6ab-4b^2
(x-1)(2x+3)
=2x^2+x-3
(2a+b+1)(2a+b-1)
=(2a+b)^2-1
=4a^2+4ab+b^2-1
3(x-1)³y-(1-x)³z m(x-y)²-x+y x²(x+y)(y-x)-xy(x+y)(x-y) 因式分解
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
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)
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²把下列各式分解因式x(x+y)(x-y)-x(y+x)²7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
1.4(x-y-1)=3(1-y)-22/x+3/y=22.5(x+y)-6=43x+3y+7y=10
多项式成多项式(一):(-4X-Y)(-5X+2Y)(二):(Y-1)(Y-2)(Y-3)(三):(2x+3y)(3x-2y)(四):(x+2)(x+3)-(x+6)(x-1)(五):(3x+2y)(2x+3y)-(x-3y)(3x+4y)
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
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}
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
(6x+2y)-1/2(-2x-4y)(2x-3)(x-2)
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
(x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3