Mathematics
Senior High
なんで答えが赤のようになるんですか？
+'
(2)x+1+3x+4 ≥0
7) |x-1|20
x+1≧0
x = -1
x+1+3x+4≧0
4x≧-5
..S
X=
min
3
2
3
x = - =
≦x<-1
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