解二元一次方程组,急用!0.8x-1.7y=-75x-3y=24x+y=45x-1=1.8-x-6yx/5-y/2=-4x/15-y/7=-3(2x-y)/5=(x=y)/3=3x/2-(2/3)y=-(2/15)x/2-(5/3)y=-(4/3)
2019-05-28
解二元一次方程组,急用!
0.8x-1.7y=-7
5x-3y=2
4x+y=45
x-1=1.8-x-6y
x/5-y/2=-4
x/15-y/7=-3
(2x-y)/5=(x=y)/3=3
x/2-(2/3)y=-(2/15)
x/2-(5/3)y=-(4/3)
优质解答
0.8x-1.7y=-7(1)
5x-3y=2(2)
(1)*50-(2)*8
40x-85y-40x+24y=-350-16
-61y=-366
y=6
x=4
4x+y=4.5 (1)
x-1=1.8-x-6y
2x+6y=2.8
x+3y=1.4 (2)
(1)×3-(2)
12x+3y-x-3y=13.5-1.4
11x=12.1
x=1.1
y=4.5-4x=0.1
下面有点烦 只怪你分太少
0.8x-1.7y=-7(1)
5x-3y=2(2)
(1)*50-(2)*8
40x-85y-40x+24y=-350-16
-61y=-366
y=6
x=4
4x+y=4.5 (1)
x-1=1.8-x-6y
2x+6y=2.8
x+3y=1.4 (2)
(1)×3-(2)
12x+3y-x-3y=13.5-1.4
11x=12.1
x=1.1
y=4.5-4x=0.1
下面有点烦 只怪你分太少