[10x+14y=160,5x-3y=30]要有过程
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 08:52:03
[10x+14y=160,5x-3y=30]要有过程
[10x+14y=160,5x-3y=30]要有过程
[10x+14y=160,5x-3y=30]要有过程
10x+14y=160 (1)
5x-3y=30 (2)
(1)-(2)*2
10x+14y-10x+6y=160-30*2
20y=100
y=5
代入(2)
5x-15=30
5x=45
所以x=9,y=5
10x+14y=160
5x-3y=30
10x+14y=160
10x-6y=60
20y=100
y=5
将y=5带入式子中的x=9
5x+7y=80,5x=80-7y
80-7y-3y=30,10y=50,y=5
x=(80-35)/5=9
10x+14y=160
5x-3y=30
10x+14y=160
10x-6y=60
20y=100
y=5
将y=5带入式子中的x=9
第2个式子乘以2得:10x-6y=60
第1个式子减去10x-6y=60得20y=100 所以y=5
将y=5代入第2个式子得:5x-15=30 所以x=9
(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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
4x-2*(10-x)-10=5y-3*(10-y)x+y=14
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
2元1次方程组 10x+14y 5x-3y+3010x+14y=160 5x-3y=30
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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x+y)(x+y-10)+25=0,且x-y=3,求x,y
(x+y)(x+y-10)+25=0,且x-y=3,求x,y
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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
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
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5