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Answer 1

我觉得必竟你这是新车在质保期内，车子在使用地程中出现的任何故障异常，只要是保内出现的问题记得一定要直接回店去找他们,保内的问题必须让他们给彻底解决处理。

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Answer 2

2x1- x2 =10 (1)
x1-x2=3 (2)
x1=0 (3)
x2=0 (4)

2x1- x2 ≥10 (1')
x1-x2≥3 (2')
x1≥0 (3')
x2≥0 (4')

case 1: (1) and (2)
2x1- x2 =10 (1)
x1-x2=3 (2)

(1)-(2)
x1=7
from (2)
7-x2=3
x2=4

(x1,x2) = (7,4) 满足
x1≥0 (3')
x2≥0 (4')

y= x1 +2x2
y(7,4) = 7+8= 15

case 2: (1) and (3)
2x1- x2 =10 (1)
x1=0 (3)

from (1)
x2=-10

(x1,x2) = (0,-10) 不满足 (4')
x2≥0 (4')

舍去 case 2

case 3: (1) and (4)
2x1- x2 =10 (1)
x2=0 (4)

from (1)
2x1-0=10
x1=5

(x1,x2) = (5,0) 满足
x1-x2≥3 (2')
x1≥0 (3')

y= x1 +2x2
y(5,0) = 5+0= 5

case 4: (2) and (3)
x1-x2=3 (2)
x1=0 (3)

from (2)
0-x2=3
x2=-3

(x1,x2) = (0,-3) 不满足 (4')
x2≥0 (4')

舍去 case 4

case 5: (2) and (4)
x1-x2=3 (2)
x2=0 (4)

from (1)
x1-0=3
x1=3

(x1,x2) = (3,0) 不满足
2x1- x2 ≥10 (1')

舍去 case 5

case 6: (3) and (4)
x1=0 (3)
x2 =0 (4)

(x1,x2) = (0,0) 不满足
2x1- x2 ≥10 (1')

舍去 case 6

ie
min y = y(5,0) = case3 = 5