a) 234+117+(-100)+(-234)
= [234+(-234)] + [100+(-100)] +17
= 0+0+17
=17
b) (-50-79+148)-(-79+50+48)
= -50-79+148+79 - 50 - 48
=(-50-50)+(79-79)+(148-48)
=-100+0+100
= 0
c) (17-35)-(52-35-83)+(52)
= 17-35 -52+35+83 +52
=(17+83)+(35-35)+(52-52)
=100+0+0
= 100
Chúc bạn thành công!!!