作业帮解7.5x=3.5y 5x+5y=40
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 16:18:52
x){|iiiiMR>;|`!g^g桨JiFzF` {֥F@}ӡJ+*\##а 1
Er cdc?lx{)TDf~qAb 6`TJAA 6 i
解7.5x=3.5y 5x+5y=40
解7.5x=3.5y 5x+5y=40
解7.5x=3.5y 5x+5y=40
7.5x=3.5y
15x=7y .1
5x+5y=40
15x+15y=120.2
将1式代入2式得
15y+7y=120
22y=120
11y=60
y=60/11
15x=7y
15x=7*60/11
x=7*4/11
x=28/11
所以x=28/11,y=60/11
y=60/11 x=28/11
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
怎么解这方程Y/(X+Y)=40% Y/(X+Y+5)=30%
X+Y=40,(X*Y)/(X+Y)=7.5
解7.5x=3.5y 5x+5y=40
x+y=5; x^y+y^x=17
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
(X-Y)(X+Y)=5 能解么
5x-4y(y-x)=?
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；
解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1
y-x=x-5
解方程（y-x-5)y'-y+2=0
Y={X (-5
Y={X (-5
2(x-y)=5y,x-y=-5