X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/03 02:58:48
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
X+Y=7
(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
100X+Y-10Y-X=10Y+X-10X-Y
99X-9Y=9Y-9X
-18Y=-108X
Y=6X
把Y=6X代入X+Y=7
得X+6X=7
X=1
把X=1代入Y=6X
得Y=6
所以此方程组的解为X=1
Y=6
(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
可化为100X+Y-10Y-X=10Y+X-10X+Y
99X-9Y=9Y-9X
108X=18Y
6X=Y
X+Y=7 .........X=7-Y
代入6X=Y可得
6(7-Y)=Y
解得Y=6
则X=7-6=1
X+Y=7 <1>
(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) <2>
又<2>得6X=Y <3>
将<3>代入<1>得X=1 Y=6
x+y=7 (1)
(100x+y)-(10y+x)=(10y+x)-(10+y) (2)
将(2)右边移到左边并去掉括号得:
100x+y-10y-x-10y-x+10+y=0
即:108x-18y+10=0 (3)
将(1)代入(3)得:
108x-18(7-x)+10=0
解得x=189/29
y=7-x=14/29
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
7x:4y,x:y=( ):(
{(x,y) |x|+|y|
x>y?x:y
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
x+x+x+x+y+y+y=56
x+y=20,x-y=10,y=
y+10x=x+y+9 10y+x=y+10x+27
(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5
{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
y+y+x=10,x+y+x=8,y=?,x=?
已知|x|+x+y=10 |y|+x-y=12 求 x+y=?
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7