B1 Tìm x:
a) 5\(^{\left(-1\right)}\) \(\times\)26\(^x\) = 125
b) 3 \(^{\left(-1\right)}\)\(\times\)3\(^x\)+ 6 \(\times\)3\(^{x-1}\)= 7\(\times\)3\(^6\)
B2 Tìm x, y:
\(\frac{x}{2}\)= \(\frac{y}{4}\)và x\(^2\)\(\times\)y\(^2\)= 2
GIÚP MK VS! MÌNH CẦN GẤP AK!