Question

1.thực hiện phép tính .

a) 17 + 26 : 2 

b) 300 : [ 130 - 6 ( 45 - 40 ) ]

c) (-15).(-2)

d) (-27).36 + 54.(- 27)

Answer 1

\(a.17+26:2\\ =17+13\\ =30\\ b.300:\left[130-6\left(45-40\right)\right]\\ =300:\left[130-6.5\right]\\ =300:\left[130-30\right]\\ =300:100\\ =3\\ c.\left(-15\right).\left(-2\right)\\ =15.2\\ =30\\ d.\left(-27\right).36+54.\left(-27\right)\\ =\left(-27\right)\left(36+54\right)\\ =\left(-27\right).90\\ =-2430\)

Answer 2

a) 17+14=31

b) 300:[130-6.5)

300:[130-30]

300:100

3

c)30

d)(36+54).(-27)

=90.(-27)

=-2430