用代入方程解x和y的值(x-1)-2y+3=0,3-x/3=(y+3)/6急需!
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用代入方程解x和y的值(x-1)-2y+3=0,3-x/3=(y+3)/6急需!
用代入方程解x和y的值(x-1)-2y+3=0,3-x/3=(y+3)/6急需!
用代入方程解x和y的值(x-1)-2y+3=0,3-x/3=(y+3)/6急需!
第二个方程化简下,有:
18-2x=y+3 即2x+y=15 ③
由第一个方程,得:
x=2y-2 代入方程③,有:
2(2y-2)+y=15
5y=19
y=19/5,再代入方程③,有x=28/5.
x=2y-2(1)代入第二个方程得
3-(2y-2)/3=(y+3)/6,两边乘6得
18-4y+4=y+3
y=19/5,代入(1)得
x=28/5
(x-1)-2y+3=0 3-x/3=(y+3)/6
x-1-2y+3=0 左右乘以6 18-2x=y+3
x-2y+2=0 18-2x-3=y
...
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(x-1)-2y+3=0 3-x/3=(y+3)/6
x-1-2y+3=0 左右乘以6 18-2x=y+3
x-2y+2=0 18-2x-3=y
y=15-2x 代入左式
x-2(15-2x )+2=0
x-30+4X+2=0
5X=28 x=28/5 代入y=15-56/5 y=19/5
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