5/3•5/7–14/3•5/7 5/7(5/3–14/3)
------------------------ = ------------------ =
81/49–9/7•2/7 81/49–18/49
5/7•(-3) 15•49 5
= ---------- = – --------- = – -----
63/49 7•63 3
Решение во вложении..........
1)складываем показатели, имеем
3^(x+0,5+x-2)=3^0
x+0,5+x-2 = 0
2x-1,5 = 0
2x=1,5
x=0,75
2)3^(x²+x-12) = 3^0
x²+x-12 = 0
x1 = -4, x2 = 3