Question

Calculati : a) 0,6 • 1 1/9 -7/9 : (2-1/4). b) (3 8/9 - 1,5 ) : ( 3 1/2 + 0,8 ) +2,(4)

Answer 1

a) 0,6×1 1/9-7/9:(2-1/4) =

0,6×10/9-7/9:(2-1/4)=

3/5×10/9-7/9÷7/4=

2/3-7/9×4/7=

2/3-1/9×4=

2/3-4/9=

2/9

b) (3 8/9-1,5):(3 1/2+0,8)+2,(4)=

(35/9-1,5):(7/2+0,8)+22/9=

(35/9-3/2):(7/2+4/5)+22/9=

43/18:43/10+22/9=

43/18×10/43+22/9=

1/9×5+22/9=

5/9+22/9=

3

Answer 2

a) 0,6 = 6/10 = 3/5

3/5 * 10/9 - 7/9 : (7/4) = 6/9 - 7/9*4/7 = 6/9 - 4/9 = 2/9

b) (35/9 - 3/2) : (7/2 + 4/5) + 22/9 = (70/18 - 27/18) : (35/10 + 8/10) + 22/9 = 43/18 : 43/10 +22/9 = 43/18 * 10/43 + 22/9 = 10/18 + 22/9 = 10/18 + 44/18 = 54/18 = 3