七年级数学下册方程组练习题.doc

1、二元一次/三元一次方程组练习2x+9y=81 9x+4y=353x+y=34 8x+3y=307x+2y=52 x+2y=217x+4y=62 3x+5y=564x+6y=54 2x+y=7 9x+2y=87 2x+5y=19 5x+7y=52 5x+5y=65 5x+2y=22 7x+7y=203 8x+4y=56 x+8y=15x+4y=21 4x+y=295x+7y=41 7x+5y=545x+8y=44 3x+4y=38 3x+6y=24 9x+2y=62 9x+5y=46 4x+3y=36 9x+4y=46 9x+3y=997x+4y=42 4x+7y=959x+7y=13 3x+8

2、y=51 4x+y=41 x+6y=279x+2y=38 5x+5y=453x+6y=18 7x+9y=698x+2y=28 5x+4y=527x+8y=62 7x+6y=74x+6y=14 7x+4y=673x+3y=27 2x+8y=26 7x+y=9 6x+6y=48 4x+6y=16 6x+3y=42 8x+2y=16 6x+8y=687x+y=11 7x+6y=664x+9y=77 2x+2y=228x+6y=94 7x+2y=472x+7y-z=24 x+y+z=7 4x-4y+z=-3 2x+y-z=5 x+y=5 x-y-2z=4 a+b+c=0 5x-4y+4z=134a+2

3、b+c=3 2x+7y-3z=199a-3b+c=28 3x+2y-z=18a+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=122x-y+2z=2 x+2y-z=6x-y-z=-3 3x-y+z=102x+3y=6 2a+b+c=0 x-y+2z=-1 4a+2b+c=5x+2y-z=5 2a-b+c=43x-y+z=4 x+y-z=5 x+y+z=6 2x+3y+z=10 2x

4、+3y-z=12 x-2y-z=10 x+y+z=6 x-y-5z=4 x-y=1 2x+y-3z=102x-y+z=5 3x+y+z=83x-y+2z=3 3x+2y+5z=2 2x+y-3z=11 x-2y-z=6x+y+z=12 4x+2y-7z=30x+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=62x+3y+6z=9 2x+3y+z=115x+3y+9z=15 3x-y-z=-23x-y+z=4 x+2y+z=22x+3y-z+12 x-4y+z=5 x+y+z=6 2x-2y-5z=0- 11 -