已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 20:28:33
![已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式](/uploads/image/z/3989460-12-0.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%EF%BC%9D9%2Cxy%EF%BC%9D20%2C%E6%B1%82+y%2B1%C3%B7x%2B1+%2Bx%2B1%C3%B7y%2B1%E7%9A%84%E5%80%BC+%E9%99%A4%E5%8F%B7%E4%B8%BA%E5%88%86%E6%95%B0%E5%BD%A2%E5%BC%8F)
x=
@eF6A%."YY( ګMDbU\Wpf
Xͼ}l:dN}G 9LqH1.iCMzxqӃiNA!W&0mo5Ƴ}H,,7&3*< R!hqIR?ImXp|A1}¹P *Sroif\ Ws
已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式
已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式
已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式
x+y=9,xy=20
(y+1)÷(x+1) +(x+1)÷(y+1)
= { (y+1)^2+(x+1)^2 } / { (x+1)(y+1)}
= { y^2+2y+1+x^2+2x+1 } / { xy+x+y+1}
= { (x^2+y^2)+2(x+y)+2 } / { xy+x+y+1}
= { (x+y)^2-2xy+2(x+y)+2 } / { xy+(x+y)+1}
= { 9^2-2*20+2*9+2 } / {20+9+1}
= { 9^2-2*20+2*9+2 } / 30
= 61/30
已知x+y=9,xy=20,求 y+1÷x+1 +x+1÷y+1的值 除号为分数形式
已知1÷y-1÷x=5,求(2x+4xy-2y)÷(x-3xy-y)的值
已知 x+y=4,xy=2,求2xy+4xy+2xy
已知x+y=1求x+y+3xy的值
已知,x+y=9且xy=20求1/x^2-1/y^2
已知X方+4XY+Y方=0 求X+Y分之X-Y
已知(1/x)-(1/y)=5,求(6x+7xy-6y)/(8y-9xy-8y)
已知x-y=9,xy=负20,求(x+y)(x+y)
已知x(x-1)-(x²-y)=-3,求(x²y+xy²)÷xy-2y
已知x+y=-9,xy=20,求y+1/x+1+x+1/y+1 的值
已知x+y=9,xy=20,求 y+1 /x+1 + x+1/ y+1 的值
已知x-xy=20,xy-y=-10,则x-y=?x+y-2xy=?
已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知|3-y|+|x+y|=0,求[2(x+y)-3(xy+4)]÷1/xy的值.
已知x*x-xy=-3,2xy-y*y=-8求2x+4xy-3y*y
已知,x+y=2,xy=-2分之1,求,x³y-2x²y²,+xy³
已知1/x-1/y=4,求(2x+xy-2y)/(x-2xy-y)的值