Mathematics
Senior High

解説お願いします。

次の不等式を解け。 (1)|x| + |æ-1|≦x+4

Answers

x<0のとき
-x-x+1≦x+4
-3x≦3
x≧-1
-1≦x<0

0≦x<1のとき
x-x+1≦x+4
-3≦x
0≦x<1

1≦xのとき
x+x-1≦x+4
x≦5
1≦x≦5

あわせて
-1≦x≦5

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