Question

Tìm x:

a) (10 + 2.x). 4³ = 4⁵

^{b)tìm số nguyên nhé}

4⁵.(2x - 4³)=4²

c)Tìm soos nguyên

5.x - 12 = (- 16) + 19

nhanh nhé mk đang vội

Answer 1

c )

5.x - 12 = (- 16) + 19

5.x - 12 = 3

5.x = 3 + 12

5.x = 15

x = 15 : 5

x = 3

Answer 2

a)\(\left(10+2x\right)\cdot4^3=4^5\)

\(10+2x=4^5:4^3\)

\(10+2x=4^2\)

\(2x=4^2-10\)

\(2x=6\)

x=3

c)\(5x-12=\left(-16\right)+19\)

\(5x-12=3\)

\(5x=3+12\)

\(5x=15\)

x=3

 

 

Answer 3

a) \(\left(10+2x\right).4^3=4^5\)

\(\Rightarrow10+2x=4^2\)

\(\Rightarrow10+2x=16\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=3\)

Vậy \(x=3\)

b) \(4^5\left(2x-4^3\right)=4^2\)

\(\Rightarrow2x-4^3=4^{-3}\)

\(\Rightarrow2x-64=\frac{1}{64}\)

\(\Rightarrow2x=\frac{1}{64}+64\)

\(\Rightarrow2x=\frac{4097}{64}\)

\(\Rightarrow x=\frac{4097}{128}\)

Mà \(\frac{4097}{128}\ne Z\)

\(\Rightarrow x\) không có giá trị thỏa mãn

Vậy \(x\) không có giá trị thỏa mãn

 

Answer 4

Quên phần c:
\(5x-12=\left(-16\right)+19\)

\(\Rightarrow5x-12=3\)

\(\Rightarrow5x=15\)

\(\Rightarrow x=3\)

Vậy \(x=3\)