VALENTINE2506
Answered

Bonjour
Merci de m’aider pour cet exercice ☺️

Bonjour Merci De Maider Pour Cet Exercice class=

Sagot :

AMERINFOCONTACT

1) C = a + b = -4/7 + 5/8 = -4/7 × 1 + 5/8 × 1 = -4/7 × 8/8 + 5/8 × 7/7 = (-4×8)/(8×7) + (5×7)/(7×8) = -32/56 + 35/56 = (-32+35)/56 = 3/56

D= 28ab = 28 × (-4/7) × (5/8) = 28 ×(-4×5)/(7×8) = (28 × (-20))/56 = 560/56 = 10

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