1/3x+3/4y=5/12 2/3x-5/6y=-1/3 x和y各是多少?
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1/3x+3/4y=5/12 2/3x-5/6y=-1/3 x和y各是多少?
1/3x+3/4y=5/12 2/3x-5/6y=-1/3 x和y各是多少?
1/3x+3/4y=5/12 2/3x-5/6y=-1/3 x和y各是多少?
列方程组约分得:
{1,4X+9Y=5
{2,4X-5Y=-2
由1式减2式,代入得
X=1/8
Y=1/2
4(x+2)=1-5y 4(x+y)-3(x-y)=12
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
3x-y+x=3 4【X-y-1】=3【1-y】-1 5x-4y+4x=3 2x+y-3x=11 【 x除以2 】-【y 除以3】 =2 2x+7y-3x=19 x+y+x=12 3x+2y-x=18
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
计算:1.y/4x²-1/12y²+1/6xy 2.3/x-6/1-x-x+5/x²-x3.x/x-y×y²/x+y-x四次方y/x四次方-y四次方÷x²/x²+y²解方程:1.x-1/(x-2)+1=1/2-x2.x+1/x-1-4/x²-1=13.1/x+3-2/3-x=1/x²-9
化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1/90y) ,其中x=1,y=-2
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(1)x^2*x^8+x^13/x^3 (2)a^19/a^12/a^3 (3) (x-2y)^5/(2y-x)^3 (4)(x-y)^5/(x-y) (5)(x-y)^6/(y-x)^4
先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0
3x-2y=1 4x-5y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?