要20道二元一次方程组题和答案

1个回答

  • y=2x-3

    3x+2y=8

    x=2

    y=1

    2x-y=5

    3x+4y=2

    x=2

    y=-1

    2s+3t=-1

    4s-3t=8

    s=6/7

    t=-10/9

    2x-3y=7

    x-3y=7

    x=0

    y=-3/7

    2x+y=5

    x-3y=6

    x=3

    y=-1

    x+3y=7

    y-x=1

    x=1

    y=2

    x+y=4

    2x-y=5

    x=3

    y=1

    7x-7y=-11

    7x-2y=-12

    x=-1

    y=-1

    3x-5y=6

    2x-3y=4

    x=2

    y=0

    x+1=5(y+2)

    3(2x-5)-4(y+4)=5

    x=4

    y=-1

    3y+25=x

    4(y-4)=x

    x=148

    y=41

    x+y+4.2=12.8

    2x+1.5y=15

    x=5

    y=3

    3x-2y=10

    5x-4y=-130

    x=-10

    y=-20

    6x+7y=-19

    6x-5y=17

    x=1/3

    y=-3

    3(x-1)=y+5

    5(y-1)=3(x+5)

    x=5

    t=7

    2(x-y)=2y-x+1

    0.5x+0.1y=0.08*50

    x=7

    y=5

    2(x+2)-3(y-1)=13

    3(x+2)+5(y-1)=30.9

    x=6.3

    y=2.2

    x+y=m

    5x-3y=-m

    x=m/4

    y=3/4m

    x-2y=-3

    3x+y=5

    x=1

    y=2

    x+2(x+2y)=4

    x+2y=2

    x=0

    y=1