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Sagot :

3V45 +2V20 -4V80

= 3V5 x 3² + 2V5 x 2² - 4V5x 4²

= 15V5 +4V5 - 16V5 + 19V5 - 16V5 + 3V5

 

b = V18 x V8 x V50

= V18x8x50

= V 7200 = 10V72

 

 

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