{ 3(2x-y)+4(x-2y)=87 2(3x-y)+3(x-y)=142
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{3(2x-y)+4(x-2y)=872(3x-y)+3(x-y)=142{3(2x-y)+4(x-2y)=872(3x-y)+3(x-y)=142{3(2x-y)+4(x-2y)=872(3x-y)
{ 3(2x-y)+4(x-2y)=87 2(3x-y)+3(x-y)=142
{ 3(2x-y)+4(x-2y)=87 2(3x-y)+3(x-y)=142
{ 3(2x-y)+4(x-2y)=87 2(3x-y)+3(x-y)=142
3(2x-y)+4(x-2y)=87
6x-3y+4x-8y=87
10x-11y=87.1
90x-99y=783.2
2(3x-y)+3(x-y)=142
6x-2y+3x-3y=142
9x-5y=142
90x-50y=1420.3
3式-2式得
49y=637
y=13
将y=13代入1得
10x-11y=87
10x-11*13=87
10x-143=87
10x=230
x=23
所以x=23,y=13
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
y'=(y/x)^2+y/x+4微分方程
(y-x)^4(x-y)^3+2(x-y)^6(y-x)
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
3x+y=2 -y/x+y=123x+y=2 (-y/x)+y=12
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
2(x-y)²-3(x-y)(-y-x)
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+2y=3(x+y)+5 3x-4y=4(x+y)-15
解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3(x-y)=15
2(x+y)-(x-3y)=13,4(x+y)+3(x-3y)=1
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系(要求一步一步写出来)
(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一