Question

Tìm x

121-5×(60-5×x)=21¹⁰÷(21⁶×21³)

Answer 1

\(121-5.\left(60-5x\right)=21^{10}:\left(21^6.21^3\right)\)

\(121-5.\left(60-5x\right)=21^{10}:21^9\)

\(121-5.\left(60-5x\right)=21\)

\(5.\left(60-5x\right)=121-21\)

\(5.\left(60-5x\right)=100\)

\(60-5x=100:5\)

\(60-5x=20\)

\(5x=60-20\)

\(5x=20\)

\(\Rightarrow x=4\)

Answer 2

\(121-5.\left(60-5x\right)=21^{10}:\left(21^6.21^3\right)\)

\(121-300+25x=21^{10}:21^{11}\)

\(25x-179=\frac{1}{21}\)

\(25x=\frac{1}{21}+179\)

\(25x=\frac{3760}{21}\)

\(x=\frac{3760}{21}:25\)

\(x=\frac{752}{105}\)

vay \(x=\frac{752}{105}\)