解方程组(1) x+2y/2=y-x/4=2x+1/3 (2){2x+3y/4+2x-3y/3=7 {2x+3y/3+2
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/13 16:18:16
解方程组(1) x+2y/2=y-x/4=2x+1/3 (2){2x+3y/4+2x-3y/3=7 {2x+3y/3+2x-3y/2=8 如果2x-3y=11-4m
(2)
2x+3y)/4+(2x-3y)/3=7……(1)
(2x+3y)/3+(2x-3y)/2=8……(2)
(1)×12得
6x+9y+8x-12y=84
即:14x-3y=84……(3)
(2)×6得
4x+6y+6x-9y=48
即:10x-3y=48……(4)
(3)-(4)
4x=36
x=9
把x=9带入(3)得
y=14
x=9,y=14.
2x+3y)/4+(2x-3y)/3=7……(1)
(2x+3y)/3+(2x-3y)/2=8……(2)
(1)×12得
6x+9y+8x-12y=84
即:14x-3y=84……(3)
(2)×6得
4x+6y+6x-9y=48
即:10x-3y=48……(4)
(3)-(4)
4x=36
x=9
把x=9带入(3)得
y=14
x=9,y=14.
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