Question

Efectuati:
a) 3,8 • 0,(5)=
b) 15 • 0,4(4) • 4 1 supra 2=

Answer 1

a) 3,8 • 0,(5)= 38/10 x 5/9 = 19/5 x 5/9 = 19/9

b) 15 • 0,4(4) • 4 1 / 2=  15 x 40/90 x 41/2 = 15 x 4/9 x 41/2 = 410/3

Answer 2

a) 3,8*0,(5)=(38/10)*(5/9)=190/90=19/9=2,(1)

b) 15*0,4(4)*(41/2)=15*(44-4)/90*(41/2)=15*(40/90)*41/2=15*(4/9)*41/2= (60/9)*41/2=(20/3)*(41/2)=820/6=410/3