32*3/10 *5 -7 -7( 21*3/10*5 -3/10)
96/50 -7 -7( 63/50 -3/10)
96/50 -7 -7( 63-15/50<span>)
</span>96/50 -7 -7( 48/50<span>)
</span>-254/50 - 336/50
-590/50
-11,8
1) (√а(√а-√в)+ √в(√а+√в))/(√а+√в)(√а-√в) + 2√ав/(а-в) *(√a-√b) = (а-√ав+в+√ав)/(а-в) + 2√ав/(а-в) *(√a-√b) = √а^2+2√ab+√b^2/(√a+√b)(√a-√b) *(√a-√b) = (√a+√b)-(√a+√b)*(√a-√b)= (√a+√b)
A²+2ab+b²..........................
Решение:
log _1/3 (5-2x) = - 3
ОДЗ: 5 - 2х > 0, х < 2,5
log _1/3 (5-2x) = log_1/3 (1/3)^(-3)
log _1/3 (5-2x) = log_1/3 3^3
log _1/3 (5-2x) = log_1/3 27
5 - 2х = 27
- 2х = 27 - 5
- 2х = 22
х = 22 : (-2)
х = - 11
Ответ: - 11.