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a. |a| = 12
=> a = 12 hoặc a = -12
b. |a| = |-12|
=> |a| = 12 => a = 12 hoặc a = -12
c. |a + 2| = 0
=> a + 2 = 0 => a = -2
d. -17|a| = -85 => |a| = 5 => a = 5 hoặc a = -5
e. |a| = -16 (vô no vì trị của 1 số luôn > 0)
a)\(\left|a\right|=12\)
\(\Rightarrow\orbr{\begin{cases}a=12\\a=-12\end{cases}}\)
b)\(\left|a\right|=\left|-12\right|\)
\(\Rightarrow\left|a\right|=12\)
\(\Rightarrow\orbr{\begin{cases}a=12\\a=-12\end{cases}}\)
c)\(\left|a+2\right|=0\)
\(\Rightarrow a+2=0\)
\(\Rightarrow a=-2\)
d)\(-17.\left|a\right|=-85\)
\(\Rightarrow\left|a\right|=\frac{-85}{-17}=5\)
\(\Rightarrow\orbr{\begin{cases}a=5\\a=-5\end{cases}}\)
e) \(\left|a\right|=-16\)(Vô lí )
hok tốt!!
36.I am doing my homework now.
37.Everyone gathered to wath the firework in New year's Eve.
38.Peter is the tallest boy in his class.
39.The Mekong River is longer than the red river.
40.He is older than his friend.
HT~
36. I am doing your homework now
37. Everyone in gather watches firework on New year's Eve
38. Peter is the tallest in boy his class
39. The Mekong River is longer than the Red River
40. He is older than his friend
# Kukad'z Lee'z
=90.4+90.2=90.6=540
90 + 90 + 90 + 90 + 90 x 2
= 90 + 90 + 90 + 90 + 90 + 90
= 90 x 6
= 540