bjr

a = 28 x (52 - 62) = 28 x (-10) = - 280

b = -2,51 x (73 + 27) = - 2,51 x 100 = -251

c = 5 x (-43 + 63) =  5 x 20 - tu trouves

Bonjour,

a)

28 * (52-62)

28 -10  = -280

b)

27=73 = 100

-2,51 * 100 = -251

c)

-5( 43 -63 )

43 -63 = 20

-5 * 20 = -100