-1 2x加1 5y=1用含x的代数式表示y则y=-搜答案-灵鹊做题网

3x+2y=15那么2y=15-3x那么y=15-3x/2

4x+2=3（2y+1）4x+2=6y+3-6y=3-2-4x-6y=-4x+1y=(-4x+1)/-6y=2/3x-1/6

2x+5y=15y=1-2xy=(1-2x)/52x+5y=12x==1-5yx=(1-5y)/2

x/3+y/4=1/2x+3y/4=3/2x=3/2-3y/4x=(6-3y)/4x/3+y/4=1/24x/3+y=2y=2-4x/3y=(6-4x)/3

y(x+1)=x-1yx+y=x-1x-xy=y+1x=(y+1)/(1-y)

3X+2y=1x=(1-2y)/3y=(1-3x)/2

2(3x-y)=x-86x-2y=x-85x=2y-8x=(2y/5)-(8/5)

y=(25-x)/9x=25-9y

∵x=3^m+1;∴y=9^(m+1)+3=3^(2m+2)+3=3^2m*3²+3=9(3^m)^2+3=9（x-1）²+3=9x²-18x+12即y=9x²

(y-1)/8±(1/2)(y~2-2y+9)^1/2

两边乘以63（x+y）-2（x-y）=6x+5y=6y=1/5(6-x)

（X+Y）/2-(X-Y)/3=1?如果是这样的话等式两边同时乘以公倍数6得到的答案是Y=(6-X)/5

中间是不能求出x等于多少,y等于多少的.其实不用那么麻烦：y=x-1/x+2,得x-1=xy+2y,(1-y)x=2y+1所以x=(2y+1)/(1-y)

x=(y-1)/(y+1)x(y+1)=y-1xy+x=y-1xy-y=-x-1y(x-1)=-(x+1)y=-(x+1)/(x-1)

移项得：-32y=1-12x系数化1得：y=13x-23．故填y=13x-23．

y=（3-3x）／2

6(x+y)-5(2x-3y)=16x+6y-10x+15y=1-4x+21y=14x=21y-1x=(21y-1)/4很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮.

3xy-x=2y-1；(3x-2)y=x-1;y=(x-1)/(3x-2);

若x=3^m-1,y=2+9^m=2+(3^m)²所以3^m=x+1,(3^m)²=y-2故y-2=(x+1)²所以y=x²+2x+3如果不懂,祝学习愉快!

⑴x=2t+3,则t=(x-3)/2代入y=3t-1,得y=3(x-3)/2-1,所以y=3x/2-11/2⑵y=3t-1,则t=(y+1)/3代入x=2t+3,得x=2(y+1)/3+3,所以x=2