:1) 4 в степени 1, 5-log16 25 2) 3-log5 10+log5 50

Найти p процентов от числа а, если: 1)a=400, p=27 => p/a *100% = 27/400 * 100% = 6,75%2)a=2.5, p=120 => p/a *100% = 120/2.5 * 100% = 4800% 3)a=2500, p=0.2 => p/a *100% = 0.2/2500 * 100% = 0.008%4)a=4.5, p=2.5 => p/a *100% = 2.5/4.5 * 100% ≈ 55.6% найти число, если p процентов от него равны b: 1)p=23%, b=690 =>   p = 0.23 => a = b/p = 690 / 0.23 = 30002)p=3.2%, b=9.6 => p=0.032=> a = b/p = 9.6/0.032 = 300 3)p=125%, b=3.75=> p = 1,25=> a = b/p = 3.75/1.25 = 3 4)p=0.6%, b=21.6 => p = 0.006 => a = b/p = 21.6/0.006 = 3600 какой процент  составляет  число a от числа b: 1)a=24, b=120 => a/b * 100% = 24/120 * 100% = 20%2)a=4.5, b=90=> a/b * 100% = 4.5/90 * 100% = 5% 3)a=650, b=13=> a/b * 100% =650/13*100%=5000% 4)a=0.08, b=0.48=> a/b * 100% =0.08/0.48*100%≈ 16.7%

1) 5 - 35 + 56 = + 56 = + 56 = ( × 56) = 8 = 3

2) x - x - 2 = 0

2 × x - x = 2

x = 25

x = 25 = ± 5

3) = × = × 2 =