Question

 thực hiện phép tính (tính nhanh nếu có thể)

mai đi hc r

 

Answer 1

25: \(\left(-25\right)+8-3\)

\(=\left(-25\right)+\left(8-3\right)\)

=-25+5

=-20

26: \(\left(-28\right)+2+6\)

\(=\left(-28\right)+\left(2+6\right)\)

=-28+8

=-20

27: \(\left(-1\right)+9+12\)

\(=\left(-1+12\right)+9\)

=11+9

=20

28: \(33+8-40\)

\(=\left(33+8\right)-40\)

=41-40

=1

29: \(\left(-80\right)+20+60\)

\(=\left(-80\right)+\left(20+60\right)\)

=-80+80

=0

30: \(\left(-12\right)+3+9\)

\(=\left(-12\right)+\left(3+9\right)\)

=-12+12

=0

Answer 2

25) (-25) + 8 - 3

= (-25 - 3) + 8

= -28 + 8

= -20

26) (-28) + 2 + 6

= -28 + 8

= -20

27) (-1) + 9 + 12

= -1 + (9 + 12)

= -1 + 21

= 20

28) 33 + 8 - 40

= (33 + 8) - 40

= 41 - 40

= 1

29) (-80) + 20 + 60

= -80 + (20 + 60)

= -80 + 80

= 0

30) (-12) + 3 + 9

= -12 + (3 + 9)

= -12 + 12

= 0