作业帮{X+Y=95,40%X+78%Y=60%×65
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{X+Y=95,40%X+78%Y=60%×65
{X+Y=95,40%X+78%Y=60%×65
{X+Y=95,40%X+78%Y=60%×65
X+Y=95,40%X+78%Y=60%×65
X+Y=95,0.4X+0.78Y=39
0.4X+0.4Y=38------1式,0.4X+0.78Y=39----2式
2式-1式0.38Y=1
Y=50/19
代入X+Y=95,得
X=92又7/19
方程可以化简为
x+y=95
0.4x+0.78y=39
方程2减去方程1乘以0.4得到0.38y=1
所以y=2.63，代入求x即可
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
X+Y=40,(X*Y)/(X+Y)=7.5
X+x+x+y+y=95 x+x+y+y+y=105 x,y分别为多少
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+x+y=60 .x-y=4
{X+Y=95,40%X+78%Y=60%×65
x+y=95 40%x+78%y=60%×65方程组
x+y=450;40%x+30=60%y
{x+y=450,60%y-40%x=30
x+y=40 1.2x+1.6y=60
1000+y=60x 1000-y=40x
x+x+x+x+y=40 x+y= 13x=y=
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y=160,40%x+75%y=60%*160 x=? y=?