Question

bỏ ngoặc rồi tính

a) (2002 - 79+15) -(-79+15)

b) -(515-80+91)-(2003+80-91)

giúp mk

Answer 1

a, ( 2002 - 79 + 15 ) - ( -79 + 15 )

= 2002 -79 +15 +79 -15

= 2002

b, - ( 515 - 80 +91 ) - ( 2003 + 80 - 91 )

= -515 + 80 -91 -2003 - 80 +91 

= -2518

Answer 2

a)  \(\left(2002-79+15\right)-\left(-79+15\right)=2002-79+15+79-15=2002\)

b)  \(-\left(515-80+91\right)-\left(2003+80-91\right)=-515+80-91-2003-80+91=-2518\)

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