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Sagot :

Bonjour,

a=(4/5 - -4/25)÷8/30

parenthèses d'abord

4/5 + 4/25 = 20/25 +4/25 = 24/25

(24/25) / ( 8/30 )

= 24/25 *30/8 = 720/200 = 72/20= 36/10= 18/5

b=(11/20)/(44/55​)

= 11/20 * 55/44 = 605/ 880 = 121/176 = 11/16

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