ex 4) a. 5/8 × 3/7 × 4/9 = 5/42
b. 1/9 × 2/5 × 18/7 = 4/35
c. 2/7 × 3/10 × 14/10 = 3/25
d. 2 1/2 × 3/5 × 1/2 = 3/4
e. 4 × 3/7 × 2 1/3 = 8/7
f. 5 ×3 1/4 × 5/8 = 75/32
g. 2 1/3 × 3 1/2 × 4 = 14
h. 1/5 × 2 1/2 × 3 = 3/5
ex 5) a. 1 7/8 × 4 3/4 = 45/8 < 10
b. 6 3/5 × 3 1/4 = 99/20 < 10
c. 2 1/8 × 5 1/4 = 85 < 32 < 10
d. 3 2/5 × 3 1/2 = 51/10 < 10
raspuns: toate sunt mai mici decat 10
ex 6) a. ( 6/5 + 3/4 ) × 24/19 = 234/95
b. ( 1/6 + 7/9 ) × 18/17 = 1
c. ( 5/6 + 7/8 ) × 18/41 + 1/4 = 1
d. ( 5/12 - 3/18 ) × 4 = 1
e. ( 11/45 - 1/30 ) × 18/19 = 1/5
f. ( 11/12 - 7/15 ) × 10/9 + 1/2 = 79/81
cu placere! succes!
