x+y=95 40%x+78%y=60%×65方程组

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x+y=95 40%x+78%y=60%×65方程组
x+y=95 40%x+78%y=60%×65
方程组

x+y=95 40%x+78%y=60%×65方程组
x+y=95
40x+78y=60*65
则
40x+78(95-x)=3900
40x-78x=3900-78*95
-38x=3900-7410=-3510
x=3510/38
y=95-3510/38

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=?