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Sagot :

VINS

bonjour

soient a et b les 2 nombres

a +  b = 3

a - b =  4

a = 3 - b

3 - b - b = 4

- 2 b = 4 - 3 = 1

-  b =   0.5

b = - 0.5

a - 0.5 = 3

a =  3.5

a = 3. 5 et b =  - 0.5

a + b  =  3.5 - 0.5 =  3

a - b =  3.5 - ( - 0.5) = 3.5 + 0.4 = 4

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