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\(\left(-7\right)^x.\left(-7\right)^2=1\)
\(\Rightarrow\left(-7\right)^{x+2}=1\)
\(\Rightarrow\left(-7\right)^{x+2}=\left(-7\right)^0\)
=>x+2=0
=>x=-2
\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}\div\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}\div\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)
Bn chỉnh lại đề đi sao lại tiếng anh hả vào toán đi ko được tick đâu
a: Chuyển các câu sau theo nghĩa ko đổi:
1. It it's necessary to finish the work today
2. Those pictures are beautiful
3. I'm sorry that I broke the glass
⇒⇒ Peter apologised .....to me for broking the glass.....
4. Sally is the cleverest student in the class
⇒⇒ No one ....is cleverer than Sally in the class......
8. Some people will interview the new president on TV
.Find out corect one mistake in A,B,C or D of each sentece and then correct
1. He slept=>was sleeping in his room when the fire alarm rang.
2.Shall=>Will you close the window for me, please?
3. He gets up early in order to reviewing=>review lessons before school
4. The ambulance will be there for=>in about ten minutes
5. I've been leaning English since=>for 4 years
bn cho mik biết cách làm mấy bài như này dc k ạ! thx nhìu!
1. Fill in the gaps with the words in the box :
Last year Lan and her parents (1) ..went.. to Nha Trang (2) ...for... their holidays. They sunbathed almost every morning on the (3) .beach.... They stayed there for a week (4) ..and.... had a lot of (5) .fun... They think a (6) ...holiday... at the beach is (7) ..healthy... and pleasant. They (8) ..enjoyed.... themselves very much.
2. Read the above passage, then use the given words to make questions and answer them :
1. Where/ go/ Lan and her parents/ holidays / last year ?
- Where did Lan and her parents go on holidays last year?
- Last year Lan and her parents went to Nha Trang for their holidays.
2. How long/ they/ stay ?
- How long did they stay?
- They stayed there for a week
3. What/ they/ do/ every morning ?
- What do they do every morning?
- They sunbathed every morning on the beach
4. They/ enjoy/ themselves ?
- Did they enjoy themselves?
- Yes, they did
\(\frac{3}{7}-\frac{4}{7}:\left(x-1\right)=\frac{-5}{7}\)
\(\frac{4}{7}:\left(x-1\right)=\frac{3}{7}-\left(\frac{-5}{7}\right)=\frac{8}{7}\)
\(x-1=\frac{4}{7}:\frac{8}{7}\)
\(x-1=\frac{1}{2}\)
=> \(x=\frac{1}{2}+1=\frac{3}{2}\)
Vậy x= \(\frac{3}{2}\)
Chúc bạn học tốt !
\(\frac{3}{7}-\frac{4}{7}:\left(x-1\right)=-\frac{5}{7}\)
\(\Leftrightarrow\frac{4}{7}:\left(x-1\right)=\frac{3}{7}-\left(-\frac{5}{7}\right)\)
\(\Leftrightarrow\frac{4}{7}:\left(x-1\right)=\frac{8}{7}\)
\(\Leftrightarrow x-1=\frac{4}{7}:\frac{8}{7}\)
\(\Leftrightarrow x-1=\frac{1}{2}\)
\(\Leftrightarrow x=1\frac{1}{2}\)
Vậy: \(x=1\frac{1}{2}\)