7x-6y=3 3x+6y=9 x= y=
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7x-6y=33x+6y=9x=y=7x-6y=33x+6y=9x=y=7x-6y=33x+6y=9x=y=7x-6y=33x+6y=9两式相加10x=12x=1.28.4-6y=36y=5.4y=0
7x-6y=3 3x+6y=9 x= y=
7x-6y=3 3x+6y=9 x= y=
7x-6y=3 3x+6y=9 x= y=
7x-6y=3
3x+6y=9
两式相加
10x=12
x=1.2
8.4-6y=3
6y=5.4
y=0.9
x=1.2
y=0.9
相加:10x=12
x=1.2 y=0.9
7x-6y=3 (1)
3x+6y=9(2)
(1)+(2)得 10x=12
x=1.2
代入(1)得 8.4-6y=3
y=0.9
x=1.2,y=0.9是原方程组的解
7x-6y=3 (1)
3x+6y=9 (2) 相加
10x=12 x=1.2
代入(2)
3.6+6y=9
6y=5.4
y=0.9
x=1.2,y=0.9
两式相加,就得x=1.2,再代入一个式子,就得y=0.9
X=1.2 y=0.9
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
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