求3x+11y=50

2Y：30%=3X：50%求X:Y2Y：30%=3X：50%求X:Y2Y：30%=3X：50%求X:Y因为2Y：30%=3X：50%所以3x*30%=2y*50%所以0.9x=yx：y=1：0.9=1

求XY公式X+Y=50Y/X=3X+Y=100Y/X=3求xy...公式求XY公式X+Y=50Y/X=3X+Y=100Y/X=3求xy...公式求XY公式X+Y=50Y/X=3X+Y=100Y/X=3

已知:3x-5y=0,求x/y,x-y/y,x-y/x已知:3x-5y=0,求x/y,x-y/y,x-y/x已知:3x-5y=0,求x/y,x-y/y,x-y/x3x-5y=03x=5y→x/y=5/

3x-2y=153y-2x=11求x+y3x-2y=153y-2x=11求x+y3x-2y=153y-2x=11求x+y3x-2y=153y-2x=11两式相加可得x+y=26前面两式一加得X+Y=2

若3x-2y=15,3y-2x=11,求x+y若3x-2y=15,3y-2x=11,求x+y若3x-2y=15,3y-2x=11,求x+y两个式子相加得3x-2y+3y-2x=26x+y=26两式相加

x+(11-3)*y=17x+(23-3)*y=35求x,yx+(11-3)*y=17x+(23-3)*y=35求x,yx+(11-3)*y=17x+(23-3)*y=35求x,yx+(11-3)*y

x+4y+11=2x+3y求x=?y=?x+4y+11=2x+3y求x=?y=?x+4y+11=2x+3y求x=?y=?化简,得x+y=11则y=11-x,将y带入原方程中,得x=11/4,y=33/

x+y=503x-y=82x=?y=?求步骤x+y=503x-y=82x=?y=?求步骤x+y=503x-y=82x=?y=?求步骤4x=132x=33y=17

7x+3y=44,11x+2y=61,求x,y7x+3y=44,11x+2y=61,求x,y7x+3y=44,11x+2y=61,求x,y联立两个方程7x+3y=44(1)11x+2y=61(2)将方

x+y=112x+4y=423y+x=31求xyx+y=112x+4y=423y+x=31求xyx+y=112x+4y=423y+x=31求xy设x+y=11（1）2x+4y=42（2）（1）×2得2

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)已知x-y/x+y=3,求代数式5(x-y)/x+y

y=x^3-cosx,求yy=x^3-cosx,求yy=x^3-cosx,求yy''=3x^2+sinx

已知3x=2y求x/x+y+y/x-y-y²/x²-y²已知3x=2y求x/x+y+y/x-y-y²/x²-y²已知3x=2y求x/x+y+

已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值已知x-y=3,求[（x+y)(x-

已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y∵|x|=2,|y|

(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(

x(x-3y)=4y(x-3y),求x:yx(x-3y)=4y(x-3y),求x:yx(x-3y)=4y(x-3y),求x:y有两个未知量X和Y,因此解答的先决条件是--必须有两个等量公式,否则是求不

(x+y)(x+y-10)+25=0,且x-y=3,求x,y(x+y)(x+y-10)+25=0,且x-y=3,求x,y(x+y)(x+y-10)+25=0,且x-y=3,求x,y怎么把代数问题发到这

(x+y)(x+y-10)+25=0,且x-y=3,求x,y(x+y)(x+y-10)+25=0,且x-y=3,求x,y(x+y)(x+y-10)+25=0,且x-y=3,求x,y因为：(x+y)(x

y=3(x-y),x=2(x-y)求x,y的值y=3(x-y),x=2(x-y)求x,y的值y=3(x-y),x=2(x-y)求x,y的值y=3x-3yx=2x-2y4y=3xx=2yx^2+y^2=