Question

[Bae Jinyoung]

:a)-7105-(155-7105)

b)(35+75+(345-35-75)

c)( 2002-79+15)-(-79+15)

d)-(515-80+891)-(2003+80-91)

Answer 1

[Dương]

\(a)-7105-\left(155-7105\right)\)

\(=-7105-155+7105\)

\(=-7260+7105\)

\(=-155\)

\(b)35+75+\left(345-35-75\right)\)

\(=35+75+345-35-75\)

\(=110+345-35-75\)

\(=455-35-75\)

\(=420-75\)

\(=345\)

\(c)\left(2002-79+15\right)-\left(-79+15\right)\)

\(=2002-79+15+79+15\)

\(=1923+15+79+15\)

\(=1938+79+15\)

\(=2017+15\)

\(=2032\)

\(d)-\left(515-80+891\right)-\left(2003+80-91\right)\)

\(=-515-80+891-2003-80+91\)

\(=-595+891-2003-80+91\)

\(=296-2003-80+91\)

\(=-1707-80+91\)

\(=-1787+91\)

\(=-1696\)