Question

tinh hop li: 

a, 25-(34+25)+(-45+34)

b, -13.55+13.35-80.13

c, 50-1[-40+5.(-2)]

Answer 1

c, 50 - 1 . ( -40 - 10 )

= 50 - 1 . -50

= 50 + 50

= 100 

Answer 2

a, 25 - 34 - 25 + (-45) + 34 

= ( 25 - 25 ) - (-34 + 34) + -45

= -45 

Answer 3

265(tich nhe)

Answer 4

b, -13 . 55 + 13 . 35 - 80 . 13

= 13 . -55 + 13 . 35 - 80 . 13

= 13.( -55 + 35 - 80 )

= 13 . -100

= -1300

Answer 5

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)