Question

神经蛙

求解

11. 解一元一次方程式3"xx-7×37=18×3°,得x之值為何?
(A)
(B)
(C) 3
(D) 9

Answer 1

✨ ベストアンサー ✨

Mer

(3⁵)²*x - 7*(3⁵)*3² = 18*(3⁵)
除以3⁵
(3⁵)x - 63 = 18
(3⁵)x = 81 = 3⁴
x = 1/3