x+y=10 x-y=8
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x+y=10 x-y=8
x+y=10 x-y=8
x+y=10 x-y=8
x+y=10
x-y=8
两式相加得
2x=18
x=9
带入得
y=1
X=9 Y=1
x=9
y=1
1. x+y=10
2. x-y=8
1式+2式,得 2x=18,
1式-2式,得 2y=2
解得 x=9,y=1
x+y=10①
x-y=8 ②
①+②
2x=10+8
x=9
y=10-9
y=1
x+y=10 (1)
x-y=8 (2)
(1)+(2) 得 2x=18,故 x=9
代入(1)有 y=1
故方程组的解为: x=9,y=1
2个方程相加
X+Y+X-Y=18
2X=18
X=9
代入方程一的 Y=1
式一转换得:x=10-y 代入式二:10-y-y=8
-2y=8-10=-2
y=1
y=1代入式一:x+1=10
x=9
x+y=10 (1)
x-y=8 (2)
将(1)+(2) 得:
2x=18
故 x=9 (3)
(3)代入(1)得:
y=1 (4)
经验证,(1)(2)两式均成立。
故:方程组的解为:
x=9,y=1
y+y+x=10,x+y+x=8,y=?,x=?
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x+y=10 x-y=8
(x+y)/y=8/3则x/y=__ y/x-y=___
(x+y)/y=8/3则x/y=__ y/x-y=___
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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