Question

a) 20 + ( - 30 ) – ( - 50 ) + ( - 70) =
b) – ( - 120 ) + ( - 130 ) – ( - 250 ) + ( - 170) =
c) 151 + ( - 148 ) – ( - 156 ) + ( - 124) + ( - 80 ) =
d) 70 - ( - 90 ) + ( - 40 ) + ( - 170) + 30 =
e) - 305 + ( - 130 ) – ( - 150 ) + 170 + 48 =

Answer 1

Respuesta:

a) 20+(-30)-(-50)+(-70)=

20+(-30)+50+(-70)=

(-10)+50+(-70)=

40+(-70)=

40-70=

-30

b) -(-120)+(-130)-(-250)+(-170)=

120+(-130)+250+(-170)=

(-10)+250+(-170)=

250+(-170)=

240-170=

70

c) 151+(-148)-(-156)+(-124)+(-80)=

151+(-148)+156+(-124)+(-80)=

3+156+(-124)+(-80)=

159+(-124)+(-80)=

35+(-80)=

35-80=

-45

d) 70-(-90)+(-40)+(-170)+30=

70+90+(-40)+(-170)+30=

160+(-40)+(-170)+30=

120+(-170)+30=

(-50)+30=

-20

e) -305+(-130)-(-150)+170+48=

-305+(-130)+150+170+48=

(-435)+150+170+48=

(-285)+170+48=

(-115)+48=

-67