Question

[Sách Giáo Khoa]

Bỏ dấu ngoặc rồi tính :

a) \(\left(27+65\right)+\left(346-27-65\right)\)

b) \(\left(42-69+17\right)-\left(42+17\right)\)

Answer 1

[Phan Thùy Linh]

a) (27+65)+(346-27-65)

= 27+65+346-27-65

= (27-27)+(65-65)+346

= 0 + 0 + 346

= 346

b) (42-69+17)-(42+17)

= 42-69+17 – 42 – 17

= (42-42)+(17-17)-69

= 0 + 0 – 69

= -69

Answer 2

[Nguyễn Ngọc Minh]

a)(27+65)+(346-27-65)

=27+65+345-27-65

=(27-27)+(65-65)+346

=0+0+346

=346

b) (42-69+17)-(42+17)

=42-69+17-42-17

=(42-42)-69+(17-17)

=0-69+0

=-69