Question

要20道二元一次方程组题和答案

Answer 1

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