{2m-3n=1,3m+5n=12.9加减消元法 {X+1=5(y-2),3(2x-5)-4(3y+4)=5加减消元法
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 07:11:09
![{2m-3n=1,3m+5n=12.9加减消元法 {X+1=5(y-2),3(2x-5)-4(3y+4)=5加减消元法](/uploads/image/z/977187-3-7.jpg?t=%7B2m-3n%3D1%2C3m%2B5n%3D12.9%E5%8A%A0%E5%87%8F%E6%B6%88%E5%85%83%E6%B3%95+%7BX%2B1%3D5%EF%BC%88y-2%EF%BC%89%2C3%EF%BC%882x-5%EF%BC%89-4%EF%BC%883y%2B4%EF%BC%89%3D5%E5%8A%A0%E5%87%8F%E6%B6%88%E5%85%83%E6%B3%95)
{2m-3n=1,3m+5n=12.9加减消元法 {X+1=5(y-2),3(2x-5)-4(3y+4)=5加减消元法
{2m-3n=1,3m+5n=12.9加减消元法 {X+1=5(y-2),3(2x-5)-4(3y+4)=5加减消元法
{2m-3n=1,3m+5n=12.9加减消元法 {X+1=5(y-2),3(2x-5)-4(3y+4)=5加减消元法
2m-3n=1 ...(1)
3m+5n=12.9 ...(2)
(1)*5+(2)*3:
10m+9m=5+38.7
19m=43.7
m=43.7/19=2.3
(2)*2-(1)*(3)
10n+9n=25.8-3
19n=22.8
n=22.8/19=1.2
x+1=5(y-2)...(1)
3(2x-5)-4(3y+4)=5 ...(2)
整理:
x-5y=-11 ...(3)
6x-12y=36,即x-2y=6 ...(4)
(4)-(3):
3y=17
y=17/3
x=2y+6=52/3
马上不放过机会
2m-3n=1 ...(1)
3m+5n=12.9 ...(2)
(1)*5+(2)*3:
10m+9m=5+38.7
19m=43.7
m=43.7/19=2.3
(2)*2-(1)*(3)
10n+9n=25.8-3
19n=22.8
n=22.8/19=1.2
x+1=5(y-2)...(1)
3(2x-...
全部展开
2m-3n=1 ...(1)
3m+5n=12.9 ...(2)
(1)*5+(2)*3:
10m+9m=5+38.7
19m=43.7
m=43.7/19=2.3
(2)*2-(1)*(3)
10n+9n=25.8-3
19n=22.8
n=22.8/19=1.2
x+1=5(y-2)...(1)
3(2x-5)-4(3y+4)=5 ...(2)
整理:
x-5y=-11 ...(3)
6x-12y=36,即x-2y=6 ...(4)
(4)-(3):
3y=17
y=17/3
x=2y+6=52/3
如果还有不懂的,可以点击用户名到我网站来提问,我会尽力为你回答的
收起