1.2x+3y=4{3x-5y=132.x-2y=4{ x-y=5
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1.2x+3y=4{3x-5y=132.x-2y=4{ x-y=5
1.2x+3y=4
{
3x-5y=13
2.x-2y=4
{
x-y=5
1.2x+3y=4{3x-5y=132.x-2y=4{ x-y=5
1中第一个式子乘以3,第二个式子乘以2,相减消去X,可求出Y=17/19~
2直接相减消X,得y=1
先用X代表Y那么1中X等于4减3Y再除2把这个代入下试中,就明白拉
楼上两位不对啊!!!
1. 2x+3y=4(1)
{
3x-5y=13(2)
由(1):X=(4-3Y)/2,代入(2)
Y=-14/19 X=59/19
2. x-2y=4(1)
{
x-y=5 (2)
同样道理X=4+2Y,代入(2)
有Y=1 X=6
(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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
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) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
1.2x+3y=4{3x-5y=132.x-2y=4{ x-y=5
3X+X=( ) Y+4Y-3Y=( )
(3x-y)(y+3x)-(4x-3y)(4x+3y)=?
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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=