a) ( - 15 )2 = 225
b) 125 - 15 . ( 5 + 6 ) = 125 - 15 . 11 = 125 - 165 = - 40
c) 149 + 7 . ( 4 - 11 ) = 149 + 7 .(- 7 ) = 149 + ( - 49 ) = 100
a) (-15)2
=(-15).(-15)
=225
b)125-15.(5+6)
=125-15.11
=125.165
=20625
c)149+7.(4-11)
=149+7.(-7)
=149+(-49)
=100