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Sagot :

Explications étape par étape:

Bonjour,

a) 1/5 + 2/10

(1×2)/(5×2) + 2/10

2/10 + 2/10

4/10 = (4÷2)/(10÷2) = 2/5

b) 3/4 + 2/5

(3×5)/(4×5) + (2×4)/(5×4)

(15+8)/20

23/20

c) 1+ 8/3

3/3 + 8/3

(3+8)/3

11/3

d)2-1/3

6/3 - 1/3

(6-1)/3

5/3

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