Mathématiques

Question

Saluttttt :) J'ai Besoin d'un coup de main les amies?
Calculez A et B en faisant des regroupements astucieux:

A= (+503) - (-343.8) - (-415.5) - (+743.8) + (-203) + (-84.5)

B= (+0.28) + (+12) -(5.4) + (-9.78) -(+0.12) -(+6.6)

2 Réponse

  • Slt
    A)_ +503 + 343.8 + 415.5 - 743.8 - 203 - 84.5 
    A)_ 231

    B)_  +0.28 +12 - 5.4 - 9.78 - 0.12 - 6.6 
    B)_  - 9.59

  • A= (+503) - (-343.8) - (-415.5) - (+743.8) + (-203) + (-84.5)
    a =  503 + 343.8 +415.5 -743.8 -203-84.5
    a = 503 -203 +415.5-84.5 +343.8-743.8
    a = 300 +331 -300
    a =331

    B= (+0.28) + (+12) -(5.4) + (-9.78) -(+0.12) -(+6.6)
    b = 0.28 +12  -5.4- 9.78 -0.12 -6.6
    b = 0.28-9.78 +12 -5.4 -6.6 -0.12
    b = -9.50 +12-12 -0.12
    b = -9.62

Autres questions