Question

Calculeaza:
a) (4/5+0,2·0,4):11/100
b) [9,7+(18,03-11/2)·10]:5
c) [3/4+(0,5)²³:(0,5)²¹-0,2(3)]:23/5
Va rog ajutati-ma

Answer 1

a) (4/5+0,2·0,4):11/100= 
    ... =(0,8+0,08)*100/11=88/100*100/11 = 8;

b) [9,7+(18,03-11/2)·10]:5=
    ...=(9,7+12,53*10):5=(9,7+125,3):5 = 135:5 = 27;

c) [3/4+(0,5)²³:(0,5)²¹-0,2(3)]:23/5=
    ...=[0,75+(0,5)² - 21/90]:23/5=
       =(1 -  21/90)*5/23 =
        =(90-21)/90 * 5/23 = 69/90 * 5/23= 3/18 = 1/6;