七年级数学(下册)方程组练习题

3x+y=34 8x+3y=30

7x+2y=52 x+2y=21 7x+4y=62 3x+5y=56

4x+6y=54 2x+y=7

9x+2y=87 2x+5y=19

5x+2y=22 7x+7y=203 8x+4y=56 x+8y=15

x+4y=21 4x+y=29 5x+7y=41 7x+5y=54

5x+8y=44 3x+4y=38

9x+4y=46 9x+3y=99 7x+4y=42 4x+7y=95

9x+7y=13 3x+8y=51 4x+y=41 x+6y=27

9x+2y=38 5x+5y=45

8x+2y=28 5x+4y=52 7x+8y=62 7x+6y=74

x+6y=14 7x+4y=67 3x+3y=27 2x+8y=26

7x+y=9 6x+6y=48 4x+6y=16 6x+3y=42

8x+2y=16 6x+8y=68 7x+y=11 7x+6y=66

4x+9y=77 2x+2y=22 8x+6y=94 7x+2y=47

2x+7y-z=24 x+y+z=7 4x-4y+z=-3 2x+y-z=5

a+b+c=0 5x-4y+4z=13 4a+2b+c=3 2x+7y-3z=19 9a-3b+c=28 3x+2y-z=18

a+b+c=-2 3x-y+z=3

a-b+c=20 2x+y-3z=11 a+b=0 x+y+z=12

a+b+c=-4 x-2y-3z+18=0 49a+7b+c=8 x+3y-2z-8=0 25a+5b+c=0 x+y+2z-24=0

x+y=3 x+y+z=12

2x-y+2z=2 x+2y-z=6

x-y-z=-3 3x-y+z=10

2x+3y=6 2a+b+c=0

x+2y-z=5 2a-b+c=4

3x-y+z=4 x+y-z=5

x+y+z=6 2x+3y+z=10 2x+3y-z=12 x-2y-z=10

x+y+z=6 x-y-5z=4

x-y=1 2x+y-3z=10 2x-y+z=5 3x+y+z=8

3x-y+2z=3 3x+2y+5z=2 2x+y-3z=11 x-2y-z=6

x+y+z=12 4x+2y-7z=30

x+2y+3z=14 x-y+z=1

2x+y+z=7 3x+y-2z=2

3x+y+2z=11 x+2y-z=3

x+2y+3z=5 x+y+z=6

2x+3y+6z=9 2x+3y+z=11 5x+3y+9z=15 3x-y-z=-2

3x-y+z=4 x+2y+z=2

2x+3y-z+12 x-4y+z=5 x+y+z=6 2x-2y-5z=0