bonjour
MB² = 12.8 ² + 9.6 ² = 256
MB = √256 = 16 cm
MA² = 17.8² - 7.8 ² = 256
MA = √ 256 = 16 cm
donc MBA est isocèle
A = 7 - 36 : ( 21 - 6 * 4 )
= 7 - 36 : ( 21 - 24 )
= 7 - 36 : - 3
= 7 + 12 = 19
B = 5 - 9 + 7 * - 4
= 5 - 6 - 28 = - 29
C = x + y t
= - 3 + 20 = 17
D = ( - x + y ) : ( - t )
= ( 3 - 4 ) : ( - 5 )
= - 1 / - 5 = 1 /5