①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/
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①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/3 y-1/2=y-x ⑤x+y=1 y+z=2 z+x=3
全是方程组,希望帮我解下!
全是方程组,希望帮我解下!
①x=9+6y 3x-7y=38
3(9+6y) -7y=38
27+18y-7y=38
11y=11
y=1 x=15
②3x-4y=8 x+4y=4
3(4-4y)-4y=8
-16y=-4
y=1/4 x=3
③3x+7y=23 3x=23-7y
12x-9y=18
92-28y-9y=18
74=37y
y=2 x=3
④2x-1=y+2/3
y-1/2=y-x x=1/2
y=-2/3
⑤x+y=1
y+z=2 x-z=-1
z+x=3
x=1 y=0
z=2
3(9+6y) -7y=38
27+18y-7y=38
11y=11
y=1 x=15
②3x-4y=8 x+4y=4
3(4-4y)-4y=8
-16y=-4
y=1/4 x=3
③3x+7y=23 3x=23-7y
12x-9y=18
92-28y-9y=18
74=37y
y=2 x=3
④2x-1=y+2/3
y-1/2=y-x x=1/2
y=-2/3
⑤x+y=1
y+z=2 x-z=-1
z+x=3
x=1 y=0
z=2
①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
9y=3x-(x-1),4(x+y)-(2x+4)=8y
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话