4(х+5) 4
-------------- = ---------
(х+5)(х+5) х+5
(4/5)в степени -2= (5/4)^2=5^2/4^2=25/16
(1/27)в степени 1/3=((1\3) ^ 3)в степени 1/3=1/3^(3*1/3)=(1/3)^1=1/3
25\16-1\3=(75-16)\(3*16)=59\48
A) [( √(8²/9²) - √(1/3²)] * √(3² * 8² * 0,5² : 1) =
= (8/9 - 1/3) * (3 * 8 * 0,5) = (8/9 - 3/9) * 12= 5/9 * 12 = 20/3 = (6)2/3
б) (√5²/8² - √1/4²) * √( 0,4² * 6² * 9² : 1) =
= (5/8 - 1/4) * (0,4 * 6 * 9) = (5/8 - 2/8) * 21,6 = 3/8 * 21,6 = 8,1
3(4-x)+2(4x+1)=24
12-3x + 8x +2 = 24
14 +5x = 24
5x = 24 - 14
5x = 10
x = 2