Question

Bỏ dấu ngoặc rồi tính tổng :

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

Answer 1

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

=42-69+17-42-17

= -69

Answer 2

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

= 42 - 69 + 17 - 42 - 17

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

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

= 0 + 0 - 69

= -69

Answer 3

\((42-69+17)-(42+17)\)

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

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

\(=0+0-69\)

\(=0-69=-69\)

Answer 4

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

=42-69+17-42-17

= 42-42+17-17-69

=0+0+(-69)

\(\Leftrightarrow\)-69