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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
\(\frac{3}{7}-\frac{4}{7}:\left(x-1\right)=\frac{-5}{7}\)
\(\frac{4}{7}:\left(x-1\right)=\frac{3}{7}-\left(\frac{-5}{7}\right)=\frac{8}{7}\)
\(x-1=\frac{4}{7}:\frac{8}{7}\)
\(x-1=\frac{1}{2}\)
=> \(x=\frac{1}{2}+1=\frac{3}{2}\)
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: \(x=1\frac{1}{2}\)
1. Stop
2. What's the matter?
3. Why are you driving on the right of the road?
4. Do you want me to drive on the wrong side?
5. You are driving on the wrong side.
6. But you said that I was driving on the right side.
7.That is right. You are on the right, and that's wrong.
8. A strange country! If right is wrong,I'm right when t'm on the wrong side. So why did you stop me?
9. My dear sir, you must keep to the left. The right side is left
10. It's like a looking-glass! But I'll try to remember.
My answer:
6. 1. But you said I was driving on the right side
1. 2. Stop!
3. 3. Why are you driving on the right of the road
10. 4. It's like a looking-glass! But I'll try to remember.
8. 5. A strange country! If right is wrong, I'm right when I'm on wrong side. So why did you stop me?
7. 6. That's right! You are on the right, and that's wrong
4. 7. Do you want me to drive on the wrong side?
2. 8. What is the matter?
5. 9. You are driving on the wrong side.
9. 10. My dear sir, you must keep to the left. The right side is left
1,
a) 3,2x +(-12)x +2,7=-4,9 b)-5,6x+2,9x-3,86=-9,8
=>3,2x+(-12)x=-4,9-2,7 =>-5,6x+2,9x=-9,8+3,86
=>3,2x+(-12)x=-7,6 =>-5,6x+2,9x=-5,94
=>x[3,2+(-12)]=-7,6 =>x[(-5,6)+2,9]=-5,94
=>2x=-7,6=>x=-7,6:2=-3,8 =>-2,7x=-5,94=>x=(-5,94):(-2,7)=2,2
1. Stop!
2. What's the matter?
3. Why are you driving on the right side of the road?
4. Do you want me to drive on the wrong side.
5. You are driving on the wrong side.
6. But you said I was driving on the right side.
7. That's right! You are on the right, and that's wrong.
8. A strange country! If right is wrong, I'm right when I'm on wrong side. So why did you stop me?
9. My dear sir, you must keep to the left. The right side is left.
10. It's like a looking - glass! But I'll try to remember.
\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}\div\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}\div\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)
Bn chỉnh lại đề đi sao lại tiếng anh hả vào toán đi ko được tick đâu