Question

1. thực hiện phép tính

a. -34+16+34+7

b. 17+(-35)+(-37)+35

c. 3157+57-3159-66

d. 8715 +(-1250)+56-250

Answer 1

a. -34 + 16 + 34 + 7

= [ ( -34 ) + 34 ] + ( 16 + 7 )

= 0 + 23

= 23

b. 17 + ( -35 ) + ( - 37 ) + 35

= [ ( -35 ) + 35 ] + [ ( -37) + 17 ]

= 0 + ( -20 )

= ( -20 )

c. 3157 + 57 - 3159 - 66

( 3157 - 3159 ) + ( 57 - 66 )

= (-2) + ( -9 )

= (-11)

d. 8715 + (-1250) + 56 - 250

7465 + 56 - 250

= 7521 - 250

= 7271

Answer 2

a) \(-34+16+34+7\)

\(=\left(-34+34\right)+\left(16+7\right)\)

= \(0+23=23\)

b) \(17+\left(-35\right)+\left(-37\right)+35\)

\(=\left(-37+17\right)+(-35+35)\)

\(=-20+0=-20\)

Answer 3

c) 3157+57-3159-66

= (3157-3159)+(57-66)

= (-2) + (-9)

= -11

d) 8715+(-1250)+56-250

= (8715+56)+(-1250-250)

= 8771-1500

=7271