1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3x+2y=29 4x-5y=19 ,
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1.8x+5y=108x-5y=102.3x+2y=94x-2y=53.2x+3y=56x-2y=-64.3x+2y=294x-5y=19,1.8x+5y=108x-5y=102.3x+2y=94x-
1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3x+2y=29 4x-5y=19 ,
1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3x+2y=29 4x-5y=19 ,
1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3x+2y=29 4x-5y=19 ,
1.8x+5y=10 (1)
8x-5y=10 (2)
(1)-(2)得:10y=0;
y=0;
x=10/8=5/4;
2.3x+2y=9(1)
4x-2y=5 (2)
(1)+(2)得:7x=14;
x=2;
y=3/2;
3.2x+3y=5(1)
6x-2y=-6(2)
(2)-(1)×3,得:-11y=-21;
y=21/11;
x=-4/11;
4.3x+2y=29 (1)
4x-5y=19(2)
(1)×4-(2)×3,得:y=59/23;
x=183/23;
1、X=1.25 Y=0
2、X=2 Y=1.5
3、X=2.1 Y=0.1
4、X=3.0 Y=1.2
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5
3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=?
x+y=5!x-y=-10 x=?,y=?x+y=5!x-y=-10x=?,y=?
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
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
y+y+x=10,x+y+x=8,y=?,x=?
X+Y-8X+10Y+41=O,求X/Y-Y/X的值
(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
(7x-10y)-(-10y-5x)=?
10y+x/10x+y=5/6
x+5y=4,2x+10y=?
x+2y=5 2x+y=10
x=3/5y x-10=55%y
5x=10y x+y=3