-5(x-2y+1)-(1-3x+4y)
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-(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y)
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)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
计算:(1)8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2
(1)x(x+10)-2(3x-2) 分解因式y(2y+1)-y(y-1)+1 2x(2x-y)+y(y-2x) 2y(y-2)-y(y-4)-1 x(x+8)-8(x+2) (a+2)(a-2)-5 (x-3)(a-2)-5 (x+3)(x+4)+4分之1
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)
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
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}
{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!
计算:(1)(x+y)^9/(x+y)^5(2)(x^2+x+1)/(3)0.0001^0(4)(x+3y/2x-y)^-4
数学计算填空(5x+y)(5x-y)(5x+y)(-5x+y)(5x+y)(-5x-y)(5x+y)(x-5y)(x ^m+y ^n) (y ^n- x^ m)(x ^m+2y-3x^3)²(x-2y)(______)=4y²-x²(__________)²=m²-2m+1(只需要写一个代数式)(__________+3)²=4x²+(_______)
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
计算 x-2分之x方+1-2-x分之3-4x (x+y)x方-y方分之x方+y-x分之y方
已知2x-y=3,4x+3y=1,求5y(2x-y)²-2(y-2x)三次方
2(x+y)-(x-3y)=13,4(x+y)+3(x-3y)=1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)