Answered

Trouver la méthode de calcul mental la plus rapide pour effectuer les calcul suivants :

A = 13 x 999

B = 2 x 0.784 + 8 x 0.784

C = 17 x 101

D = 153 x 2.7 - 2.7 x 53

Sagot :

DROOPETTE
A = 13 x 999
=(13*1000)-(13*1)
=13000-13
=12987

B = 2 x 0.784 + 8 x 0.784
=0.784*(2+8)
=0.784*10
=7.84

C = 17 x 101
=(17*100)+(17*1)
=1700+17
=1717

D = 153 x 2.7 - 2.7 x 53
=2.7*(153-53)
=2.7*100
=270