x+8y=15 4x+y=29
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x+8y=15 4x+y=29
x+8y=15 4x+y=29
x+8y=15 4x+y=29
一式×4-二式得:31y=31,y=1,把y=1带入1式,得x=7
x=7 y=1把第一个式子乘以4再减第二个消去x就行了
解方程吗x=7,y=1
x+8y=15 4x+y=29
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
10.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 110.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+8y=15 4x+y=29
已知2x+2y=-8,4x+y=15求(x-y)^-(3x+2y)^
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
化简 x / y(x+y) - y / x(x+y) =
解方程组(1/X+Y)-(1/Y-X)=8/15,(5/X+Y)-5/Y=4
分式方程组 {①1/(x+y)-1/(y-x)=8/15{②5/(x+y)-5/y=-4
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
y-(x-y)=8,x+(x-y)=29 求x,
求下列微分方程的通解或特解:(1) 3y''-2y'-8y=0 (2) 4y-8y'+5y=0(3) y+4y'+29y=0,y|(下角x=0)=0,y'|(下角x=0)=15(4) 2y+5y'=5x^2-2x-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
9y=3x-(x-1),4(x+y)-(2x+4)=8y