帮算到解方程组的数学题!{7X-3Y=-14X-5Y=-17{10X+3Y+1=04X+5Y+8=0{3A=5B2A-3B=1求方程组!
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![帮算到解方程组的数学题!{7X-3Y=-14X-5Y=-17{10X+3Y+1=04X+5Y+8=0{3A=5B2A-3B=1求方程组!](/uploads/image/z/13967975-47-5.jpg?t=%E5%B8%AE%E7%AE%97%E5%88%B0%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%21%7B7X-3Y%3D-14X-5Y%3D-17%7B10X%2B3Y%2B1%3D04X%2B5Y%2B8%3D0%7B3A%3D5B2A-3B%3D1%E6%B1%82%E6%96%B9%E7%A8%8B%E7%BB%84%21)
帮算到解方程组的数学题!{7X-3Y=-14X-5Y=-17{10X+3Y+1=04X+5Y+8=0{3A=5B2A-3B=1求方程组!
帮算到解方程组的数学题!
{7X-3Y=-1
4X-5Y=-17
{10X+3Y+1=0
4X+5Y+8=0
{3A=5B
2A-3B=1
求方程组!
帮算到解方程组的数学题!{7X-3Y=-14X-5Y=-17{10X+3Y+1=04X+5Y+8=0{3A=5B2A-3B=1求方程组!
7X-3Y=-1 (1)
4X-5Y=-17 (2)
(1)*5
35x-15y=-5 (3)
(2)*3
12x-15y=-51 (4)
(3)-(4)
23x=46
x=2
把x=2代入(1)
14-3Y=-1
Y=5
X=2
Y=5
2.
10X+3Y+1=0 (1)
4X+5Y+8=0 (2)
(1)*5
50X+15Y+5=0 (3)
(2)*3
12X+15Y+24=0 (4)
(3)-(4)
38X-19=0
X=1/2
把X=1/2代入(1)
5+3Y+1=0
Y=-2
X=1/2
Y=-2
3.
3A=5B (1)
2A-3B=1 (2)
(1)*2
6A-10B=0 (3)
(2)*3
6A-9B=3 (4)
(4)-(3)
B=3
把B=3代入(1)
3A=15
A=5
A=5
B=3
1.X=2 Y=5
2.X=0.5 Y=-2
3.A=5 B=3
28x-12y=-4
28x-35y=-119
y=5 x=2
50x+15y=-5
12x+15y=-24
x=1/2 y=-2
B=3 A=5