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a) \(\left|x\right|< 1\Rightarrow-1< x< 1\Rightarrow x=0\)
b) \(\left|x+3\right|=0\)
\(\Leftrightarrow x+3=0\)
\(\Leftrightarrow x=-3\)
c) \(\left|x+2\right|=\left|12-10\right|\)
\(\Leftrightarrow\left|x+2\right|=2\)
\(\Leftrightarrow\left[{}\begin{matrix}x+2=-2\\x+2=2\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\left(-2\right)-2\\x=2-2\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-4\\x=0\end{matrix}\right.\)
d) \(\left|x+3\right|=2x-2\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x-2\ge0\\\left[{}\begin{matrix}x+3=2x-2\\x+3=\left(-2x\right)+2\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x\ge2\\\left[{}\begin{matrix}x-2x=-2-3\\x-\left(-2x\right)=2-3\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\\left[{}\begin{matrix}-x=-5\\3x=-1\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\\left[{}\begin{matrix}x=5\left(tm\right)\\x=\dfrac{-1}{3}\end{matrix}\right.\end{matrix}\right.\)
Vì \(\dfrac{-1}{3}< 1\) nên \(x=5\) thỏa mãn đề bài.
e) \(\left|x+1\right|>4\)
\(\Rightarrow\left[{}\begin{matrix}x+1>4\\x+1< 4\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x>3\\x< 3\end{matrix}\right.\)
f) \(\left|x-3\right|=\left|2x-1\right|\)
(cho thời gian suy nghĩ, mình chưa làm dạng này bao giờ)
g) \(\left|2x-1\right|-1+2x=0\)
\(\Rightarrow\left|2x-1\right|=-2x+1\)
Mà \(\left|2x-1\right|=\left|-2x+1\right|\)
\(\Rightarrow\left|-2x+1\right|=-2x+1\)
\(\Rightarrow-2x+1\ge0\)
\(\Rightarrow-2x\ge-1\)
\(\Rightarrow x\ge\dfrac{-1}{-2}=\dfrac{1}{2}\)
h) \(\left|3-2x\right|=2x-3\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x-3\ge0\\\left[{}\begin{matrix}3-2x=2x-3\\3-2x=-2x+3\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x\ge3\\\left[{}\begin{matrix}3+3=2x+2x\\3-3=-2x+2x\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ge\dfrac{3}{2}\\\left[{}\begin{matrix}6=4x\\0=0\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ge\dfrac{3}{2}\\\left[{}\begin{matrix}x=\dfrac{3}{2}\\0=0\end{matrix}\right.\end{matrix}\right.\)
Vì \(0=0\) luôn đúng nên ta có \(x=\dfrac{3}{2}\)
j) \(\left|x+1\right|+\left|x+2\right|+\left|x+3\right|+\left|x+4\right|=5x\)
(đầu hàng)
a) ( 195 - x3 ) : 7 + 105 : 102 = 28 . 22
=> (195 - x3 ) : 7 + 1000 = 1024
=> (195 - x3 ) : 7 = 1024 - 1000 = 24
=> 195 - x3 = 24 . 7 = 168
=> x3 = 195 - 168 = 27
=> x = 3 hoặc x = - 3
Vậy : x = 3 hoặc - 3
b) 3 . ( x2 - 65 ) + 15 = 810 : 88 - 1690
=> 3 . ( x2 - 65 ) + 15 = 64 - 1 = 63
=> 3 . ( x2 - 65 ) = 63 - 15 = 48
=> x2 - 65 = 48 : 3 = 16
=> x2 = 16 + 65 = 81
=> x = 9 hoặc x = - 9
Vậy : x = 9 hoặc x = - 9
Bạn nhầm môn rồi nhé!Bạn nên nhập đúng môn để có đáp án nhanh nhất!
Bạn xem lại đề có phải sai ko nhé!
5^2x-3 thì là 5^(2x-3) phải ko? Bạn nên ghi đề rõ ràng để có đáp án đúng nhất nhé
1. house / a / Minh /lake / lives / in / near / a.
…………Minh lives in a house near a lake.……………………………………………………………………………...
2. a / plays / badminton / Paul / week / twice.
…………Paul plays badminton twice a week.……………………………………………………………………………...
3. like / the / weather / fall/ What / is / the / in?
………………What is the weather like in the fall?………………………………………………………………………...
4. building / tallest / in / This / my city / the / is .
………………The is the tallest building in my city.………………………………………………………………………...
5. good / the/ there /Let’s / and / time / beach / go / have / to / a.
…………………Let's go to the beach and have a good time there.…………………………………………………………………...
6. small/thin / sister / white / and / His / lips / teeth / has.
………His sister has small white teeth and thin lips.………………………………………………………………………………...
7. do / go / When / you/ often/ swimming ?
………………When do you often go swimming?………………………………………………………………………...
8. camping / often / do / How / you / go?
………………How often do you go camping?………………………………………………………………………...
9. stay / grandparents / vacation / are / with / next / we / to / our / going / summer.
………We are going to stay with our grandparents next summer vacation.………………………………………………………………………………...
10. the / mother / in / My / house / are / father /and .
……My mother any father are in the house.…………………………………………………………………………………...
1. Minh lives in a house near a lake.
2. Paul plays badminton twice a week.
3. What is the weather like in the fall?
4. This is the tallest building in my city.
5. Let's go to the beach and have a good time there.
6. His sister has small white teeth and thin lips.
7. When do you often go swimming?
8. How often do you go camping?
9. We are going to stay with our grandparents next summer vacation..
10. My mother and my father are in my house.
1. A coin
2.It’s not right.
3. It waves (wave vừa có nghĩa là sóng xô, vừa là vẫy tay)
4.Heat, because you can catch cold. (catch cold là bị cảm lạnh)
5.Key (đáp án, lời chú thích)
6. Dictionary (vì trong từ điển, từ June sẽ đứng trước từ May)
7. Vì 12 giờ là thời gian giữa ngày, còn chữ A cũng là giữa ngày (chữ A đứng giữa từ DAY)
8. Letter “M” (2 chữ M trong từ “moment”, một chữ M trong từ “minute” và không có chữ M trong từ “a hundred years”)
a)x\(\in\left\{-5;-4;-3;-2;-1\right\}\)
b)x\(\in\left\{-2;-1;0;1;2;3\right\}\)
c)x\(\in\left\{-4;-3;-2;-1;0;1;2;3;4\right\}\)
d)x\(\in\left\{1;2;3;4\right\}\)
e)x\(\in\left\{0;1;2;3;4\right\}\)
f)x\(\in\left\{-10;-9;-8;-7\right\}\)
1 âm tiết :
-long -large -tall -thin -strong
-short -high -light -fat -weak
2 âm tiết :
-lovely -noisy -busy -worry -clever
-friendly -skillful -bright -peachful -early
3 âm tiết :
-interesting -beautiful -wonderful -delicious -suitable
-expensive -important -intelligent -exciting -comfortable
3.(x-2)+2x=10
<=> 5x - 6 + 2x = 10
<=> 7x = 16
<=> \(x=\frac{16}{7}\)
Vậy \(x=\frac{16}{7}\)
~ Chắc v
Học tốt
Trl :
10 - [12 - (-9 - 1)]
= 10 - [12 - 9 + 1]
= 10 - 12 + 9 - 1
= 6