1/x+1/y=1/21 3/x+5/y=3/14怎么结出x 和
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/17 18:13:38
xR=O0+RcԢCߑΞP%:A+$UJR8&0!w~xqY&]] <6}Y\WyJG)0fRV9&)GDfqLAc)h
N#ף:bgSC\f>-GU2U2+-Jv5s9m%^,M+jD,mԦ}綣eKM/.1pBqWQCHkd[n8#u>\o R=˷<|9H;"iYѼv|Jlx$!z bޤV<ɎG7::+V*#t589!
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
先因式分解,在求值2X(X-Y)-5Y(Y-X)+3(X-Y)2其X=-1 Y=21
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
y'=(x-y+1)/(x+y-3)通解
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y