5x+3y=28 x-7y=-2
来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/04 21:47:54
5x+3y=28x-7y=-25x+3y=28x-7y=-25x+3y=28x-7y=-2x-7y=-2x=7y-25x+3y=285(7y-2)+3y=2835y-10+3y=2838y=10+28
5x+3y=28 x-7y=-2
5x+3y=28 x-7y=-2
5x+3y=28 x-7y=-2
x-7y=-2
x=7y-2
5x+3y=28
5(7y-2)+3y=28
35y-10+3y=28
38y=10+28
y=1
x=7-2=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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=
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(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
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3