Question

Giúp mình với

Answer 1

1

a) 1/3^6

Answer 2

1

b) (18:6)^7

Answer 3

1. 

a) \(\left(\dfrac{1}{3}\right)^4.\left(\dfrac{1}{3}\right)^2=\left(\dfrac{1}{3}\right)^6\)

b) \(18^7:6^7=3^7\)

c) \(\left(\dfrac{2}{5}\right)^7:\left(\dfrac{2}{5}\right)^4=\left(\dfrac{2}{5}\right)^3\)

d) \(4^4.\left(1,5\right)^4=6^4\)

2. 

a) \(\left|x\right|=\dfrac{1}{2}\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{1}{2}\end{matrix}\right.\)

b) Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\dfrac{x}{7}=\dfrac{y}{2}=\dfrac{x-y}{7-2}=\dfrac{20}{5}=4\)

\(\dfrac{x}{7}=4\Rightarrow x=28\\ \dfrac{y}{2}=4\Rightarrow y=8\)

 

Answer 4

1

c) 2/5^3

Answer 5

1

d) (4.1,5)^4

Answer 6

2

a)1/2

Answer 7

2

b) mik hông bít nhen :)))