a, 123 - ( 155 + 123 - 55 )
= 123 - 155 - 123 + 55
= 123 - 123 -155 + 55
= 0 - 155 + 55
= -155 + 55
= -100
b, -315 - ( -43 + 17 - 315 )
= -315 + 43 -17 + 315
= -315 + 315 + 43 -17
= 0 + 26 = 26
c. -15 .49 - 15. 51
= 15. -49 - 15 . 51
= 15 ( -49 - 51 )
= 15. ( -100 )
= -1500
d. -35 . 47 - 35 . 50 + 35 . -3
= 35 ( -47 - 50 + -3 )
=35. -100
= -3500
a, 123-(155+123-55)=123-223=-100
b,-315-(-43+17-315)=26
c,-15*49-15*51=-1500
d, -35.47-35.50+35.-3=-38.97
a)123-(155=123-55) b)-315-(-43+17-315) c)-15.49-15.51
=123-155-123-55- =-135-43-17+315 =-15.(49-15)
=(123-123)-(155-55) =(315-315)-(43-17) =-15.43
=0-100 =0-26 =-510
=-100 =-26
a) =123-155-123+55 b)=-315+43-17+315 c)=-15(49-51) d)=-35(47-50)+35.(-3)
=-155+55 =43-17 =-15.(-2) =-35.(-3)+35.(-3)
=-100 =26 =30 =-3(-35+35)
=-3.0=0