Question

Bỏ dấu ngoặc rồi tính:

a)(2015-79+19)-(-79+19)

b)-(515-80+91)-(2020+80-91)

 

Answer 1

Bỏ dấu ngoặc rồi tính:

a)(2015-79+19)-(-79+19)

b)-(515-80+91)-(2020+80-91)

Giải:

a,Ta có:(2015-79+19)-(-79+19)=2015-79+19+79-19

=2015-79+79+19-19

=2015+0+0=2015

b,-(515-80+91)-(2020+80-91)=-515+80-91-2020-80+91

=-515-2020+80-80-91+91

=-2535+0+0=-2535

Answer 2

a) (2015-79+19)-(-79+19)

= 2015 - 79 +19 + 79 -19

= 2015 + (79- 79) + (19 -19)

= 2015

b) - (515 - 80 +91) -(2020 +80-91)

= -515 + 80 - 91 - 2020 -80 +91

= -515 -2020 +( 80 -80) + (91 -91)

= -2535