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解方程组{x+y/3+x-y/2=1{4(x+y)-5(x-y)=1
题目详情
解方程组{x+y/3+x-y/2=1 {4(x+y)-5(x-y)=1
▼优质解答
答案和解析
(x+y)/3 +(x-y)/2=1 (1)
4(x+y) -5(x-y)=1 (2)
(1)×12
4(x+y)+6(x-y)=12 (3)
(3)-(2)
11(x-y)=11
x-y=1 (4)
代入(2)
4(x+y)=1+5(x-y)=1+5=6
x+y=3/2 (5)
(4)+(5)
2x=5/2
x=5/4
(5)-(4)
2y=1/2
y=1/4
x=5/4 y=1/4
4(x+y) -5(x-y)=1 (2)
(1)×12
4(x+y)+6(x-y)=12 (3)
(3)-(2)
11(x-y)=11
x-y=1 (4)
代入(2)
4(x+y)=1+5(x-y)=1+5=6
x+y=3/2 (5)
(4)+(5)
2x=5/2
x=5/4
(5)-(4)
2y=1/2
y=1/4
x=5/4 y=1/4
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