Question

Efectuați: a) 2/7-3/4:7/8= b)45/10-(5/2-3/5)= c)1/8+3/8×2/5 c)-1/8+3/8×2/5 ​

Answer 1

A)

2/7-3/4*8/7=2/7-6/7=-4/7

B)

45/10-(25/10-6/10)=45/10-19/10=26/10=13/5

C)

5/40+6/40=11/40

D)

-5/40+6/40=1/40

Answer 2

Răspuns:

a) 2/7 - 3/4 : 7/8 = 2/7 - 3/4 × 8/7 = 2/7 - 6/7 = 4/7

b) 45/10 - (5/2 - 3/5) = 45/10 - (25/10 - 6/10) = 45/10 - 19/10 =26/10(se simplifica cu 2) = 13/5

c) 1/8 + 3/8 × 2/5 = 1/8 + 3/20 = 5/40 + 6/40 = 11/40