Question

Cần gấp

Answer 1

d) x-28 = 15 + 32

 x - 28 = 47

x= 47 + 28

x= 75

e ) x + 4³ = 5³

= > x + 64 = 125

x = 125 - 64 

x= 61

Answer 2

\(d,\Rightarrow x-28=47\\ \Rightarrow x=75\\ e,\Rightarrow x=125-4^3=125-64=61\\ g,\Rightarrow105-x=50\\ \Rightarrow x=55\\ h,\Rightarrow7x=2^3+3^3=8+27=35\\ \Rightarrow x=5\\ i,\Rightarrow2x=8\cdot9+138=72+138=210\\ \Rightarrow x=105\\ l,\Rightarrow2^{x+1}=32=2^5\Rightarrow x+1=5\Rightarrow x=4\\ n,\Rightarrow3^x\left(1+3+3^2\right)=351\\ \Rightarrow3^x=\dfrac{351}{13}=27=3^3\\ \Rightarrow x=3\)