Sagot :
bonjour
26 x 14 = 26 ( 10 + 4 ) = 260 + 104 = 364
56 x 19 = 56 ( 10 + 9 ) = 560 + 504 = 1 064
17 x 102 = 17 ( 100 + 2 ) = 1 700 + 34 = 1 734
47 x 99 = 47 ( 100 - 1 ) = 4 700 - 47 = 4 653
A = 12 x² - 6 x - 7 x² + 3 x - 1 + 1
A = 5 x² - 3 x
bonjour
26 x 14 = 26 ( 10 + 4 ) = 260 + 104 = 364
56 x 19 = 56 ( 10 + 9 ) = 560 + 504 = 1 064
17 x 102 = 17 ( 100 + 2 ) = 1 700 + 34 = 1 734
47 x 99 = 47 ( 100 - 1 ) = 4 700 - 47 = 4 653
A = 12 x² - 6 x - 7 x² + 3 x - 1 + 1
A = 5 x² - 3 x