x:y=2:3 6x+4y=24
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x:y=2:3 6x+4y=24
x:y=2:3 6x+4y=24
x:y=2:3 6x+4y=24
x/y=2/3 ①
6x+4y=24 ②
由①得x=2y/3,并代入②
6(2y/3)+4y=24
得 y=3
即 x=2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1
例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2