用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2

来源:学生作业帮助网 编辑:六六作业网 时间:2024/07/25 07:22:37
用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2用消元法解方程;10X+Y+2Z=1,2

用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2
用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2

用消元法解方程;10X+Y+2Z=1,25X-3Y-Z=4,5X+5Y+5Z=2
10X+Y+2Z=1 (1)
25X-3Y-Z=4 (2)
5X+5Y+5Z=2 (3)
(1)+(2)*2
10X+Y+50X-6Y=1+8
60X-5Y=9 (4)
(2)*5+(3)
125X-15Y+5X+5Y=20+2
130X-10Y=22 (5)
(5)-(4)*2
130X-120X=22-18
10X=4
X=2/5
Y=(60X-9)/5=3
Z=25X-3Y-4=-3

sb