若3x-2y=13及4x+4x+3y=6,求2x-y的值
{3(x+y)-4(x-y)=4{x+y/2+x-y/6=1{3(x+y)-4(x-y)=4{x+y/2+x-y/6=1{3(x+y)-4(x-y)=4{x+y/2+x-y/6=13(x+y)-4(x-y)=4(x+y)/2+(x-y)/6
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20由(1)得3x+3y+2x-2y=365x+y=36(
{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/3=64(x+y)-3(x-y)=-20{(x+y)/2+(x-y)/
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=64(x+y)-3(x-y)=-20,2/x+y+3/x-y=64(x+y)-3(x-y)=-20,2/x+y+3/x-y=6第二个方程是不是写错了2/(x+y)+3/(x-y)=
(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-x-y/2=63(x+y)=4(x-y)(x+y)/2-(x-y)/2=6两边同乘以2,x+y-x+y=122y
x+y/3+x-y/2=64(x+y)-2(x-y)=40x+y/3+x-y/2=64(x+y)-2(x-y)=40x+y/3+x-y/2=64(x+y)-2(x-y)=40答:(x+y)/3+(x-y)/2=64(x+y)-2(x-y)=
若x^2-4x+4+y^2-2/3y+2/9=0求x+1/y及x^2+1/y^2的值若x^2-4x+4+y^2-2/3y+2/9=0求x+1/y及x^2+1/y^2的值若x^2-4x+4+y^2-2/3y+2/9=0求x+1/y及x^2+1
(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7x(x*x-1)+x(5-x*x)-6y+
已知x,y满足:x平方+y平方-4x+6y+13=0求(3x+y)-3(3x-y)(x+y)-(x-3y)(x+3y)=?已知x,y满足:x平方+y平方-4x+6y+13=0求(3x+y)-3(3x-y)(x+y)-(x-3y)(x+3y)
(x-4y)(x-y)-(x+3y)(x-6y)-5x(2-y),其中x=﹣1/3,y=1/2(x²-nx+3)(x²+3x+m)的展开式中不含x²和x³项,求m和n的值(x-4y)(x-y)-(x+
若x\3y=y\(2x-5y)=(6x-15y)\x,求(4x²-5xy+6y)\(x²-2xy+3y²)括号的意思就是整体作分子或分母若x\3y=y\(2x-5y)=(6x-15y)\x,求(4x²
若5x+3y=3x+4y=x+2y+6,则x+y=___若5x+3y=3x+4y=x+2y+6,则x+y=___若5x+3y=3x+4y=x+2y+6,则x+y=___3x+4y=x+2y+62x-x+4y-2y=62x+2y=6x+y=6
若x/3y=y/(2x-5)=(6x-15y)/x,则(4x^2-5xy+6y^2)/(x^2-2xy+3y^2)的值为?若x/3y=y/(2x-5)=(6x-15y)/x,则(4x^2-5xy+6y^2)/(x^2-2xy+3y^2)的值
问几道数学小题1.若2x+y=3,则4^x·2^y=_______2.若x(y-1)-y(x-1)=4,则(x^2+y^2/2)-xy=_________3.已知(9^n)^2=3^8,则n=_____4.(x+2)(3x-a)的一次项系数
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y(-x+6):(x-y):(4x+y)=3:14
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y(-x+6):(x-y)=3:14推出17x-3
方程组4(x+y)=3(y+3)和x-2y=3分之7y-6x的解及详细步骤方程组4(x+y)=3(y+3)和x-2y=3分之7y-6x的解及详细步骤方程组4(x+y)=3(y+3)和x-2y=3分之7y-6x的解及详细步骤
2(x+y)-(x-3y)=134(x+y)+3(x-3y)=1解方程组2(x+y)-(x-3y)=134(x+y)+3(x-3y)=12(x+y)-(x-3y)=134(x+y)+3(x-3y)=1解方程组2(x+y)-(x-3y)=13
设x,y满足x+3y+|3x-y|=19,2x+y=6则X=Y=设x,y满足x+3y+|3x-y|=19,2x+y=6则X=Y=设x,y满足x+3y+|3x-y|=19,2x+y=6则X=Y=x=0.5,y=5