giúp mình giải bài này tìm x : 2 mũ x nhân 8 = 128 243 : 3 mũ x =27
2 câu trả lời
\(\begin{array}{l} + )\,\,\,{2^x}.8 = 128\\ \,\,\,\,\,\,\,\,{2^x} = 128:8\\ \,\,\,\,\,\,\,\,{2^x} = 16\\ \,\,\,\,\,\,\,\,{2^x} = {2^4}\\ \,\,\,\,\,\,\,\,x = 4\\ + )\,\,243:\,\,{3^x} = 27\\ \,\,\,\,\,\,\,\,{3^x} = 243:27\\ \,\,\,\,\,\,\,\,{3^x} = 9\\ \,\,\,\,\,\,\,\,{3^x} = {3^2}\\ \,\,\,\,\,\,\,\,x = 3 \end{array}\)