x=91,y=100-搜答案-智慧作业帮

x+y/4=100

x=50,y=200;x=80,y=80;x=70;y=10;好多呢嘛.

x+x+x+y+y=54,x+x+y+y+y=56得出3X+2Y=54,2X+3Y=56扩大后得出6X+4Y=108,6X+9Y=118两式相减得出Y=2得出X=50/3

最大公约数(x、y)=y最小公倍数【x、y】=x*y/100

已知X+Y=100,X*Y=100

X+Y=100,X*Y=100设t^2-100t+100=0t=100+√10000-400/2=50+20√6或t==50-20√6所以x/y==(50+20√6)/(50-20√6)=(5+2√6

把X+Y=33乘3得3X+3Y=99用3X+4Y=100去减3X+3Y=99得到Y=1把Y=1带入X+Y=33得X=32X=32Y=1

x(x-y)+y(y-x)=x(x-y)-y(x-y)=(x-y)(x-y)=(x-y)²明教为您解答,请点击[满意答案];如若您有不满意之处,请指出,我一定改正!希望还您一个正确答复!祝您

把X+yX-y看成整体X+Y=20X-Y=16X=18Y=2

x+y=5; x^y+y^x=17

X=2,Y=3或X=3,Y=2

求y'=y/(y-x)

∵令y=xt,则y'=xt'+t代入原方程,得xt'+t=t/(t-1)==>xt'=(2t-t^2)/(t-1)==>(t-1)dt/(2t-t^2)=dx/x==>2dx/x+[1/t+1/(t-

X+Y分之X-Y等于3x=-2yX+Y分之2(x-y)减X+Y分之3X+Y=(-x-3y)/(x+y)=1

(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)100X+Y-10Y-X=10Y+X-10X-Y99X-9Y=9Y-9X-18Y=-108XY=6X把Y=6X代入X+Y=7得X+6X=

因为(x-y)/(x+y)=3,则(x＋y)/(x－y)＝1/3则5(x-y)(x+y)-(x+y)/2(x-y)＝5*3-1/(3*2)=15-1/6=89/6

由X-Y=500得Y=X-500代入(X-300)/Y*100%=120%(X-300)/(X-500)=1.2X-300=1.2(X-500)X-300=1.2X-6000.2X=300所以X=15

先一个一个的展开括号项,再同项合并就行了啊[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x=[xx-xy-(xy-yy)+x(x-y)+y(x-y)]÷2x=[xx-xy-xy+yy+xx-

//语言有严格的语法,楼主写错了不少.//建议改正程序,再理解.#include<stdio.h>voidmain(){\x09inta=100,x=10,y=20,ok1=5,ok2=0

X=24Y=26XY=624再问：翻译再答：哦……若有两个偶数，满足……，则……可以吗？

x+y=91(1)w+y=63(2)w+x=46(3)三式相加得2x+2y+2w=200所以x+y+w=100x=37y=54w=9祝你好运

x+y=100,85%x+75%y=81

x+y=100所以0.75x+0.75y=100*0.75=75(1)85%x+75%y=810.85x+0.75y=81(2)(2)-(1)0.1x=6x=60y=100-x=40

假设：X=Y/XY=X/Y带入函数就是：F(y/x,x/y)=（y/x+x/y）/(y/x—x/y)=x²+y²)/(y²-x²)希望可以帮助你!

) y=cos(x-y)

1.两边求导得：y'=-sin(x-y)(1-y')解得y'=sin(x-y)/[sin(x-y)-1]2.y'=-e^-xy''=e^-xy'"=-e^-x3.y'"=(e^2x)'"(sinx)+