Question

1. Thực hiện phép tính ( tính nhanh nếu có thể ) :

a) [( -52 ) + 18] . ( -7 )                           b) ( 18 - 3 . 21 ) + ( -24 )

c) ( -40 ) : 8 + 3 . ( 21 - 33 )                  d) ( -4 ) . 125 . ( -25 ) . ( -6 ) . ( -8 )

Mng giúp em với ạ!!!

Answer 1

a) =-34.-7

=238

b) =-45-24

=-69

hacker 2k6

Answer 2

\(a,\left[\left(-52\right)+18\right].\left(-7\right)\)

\(=\left[-52+18\right].\left(-7\right)\)

\(=-34.\left(-7\right)=34.7\)

\(=238\)

\(b,\left(18-3.21\right)+\left(-24\right)\)

\(=\left(18-63\right)-24\)

\(=18-63-24=-69\)

Answer 3

a) [(-52)+18] x (-7)

=-34 x (-7)

=238

b) (18-3 x 21)+(-24)

=(18-63)-24

=-45-24

=-69

c) (-40):8+3x(21-33)

=-5+3 x (-12)

=-5-36

=-41

d) (-4) x 125 x (-25)  x (-6) x (-8)

= [(-4) x (-25)] x [125 x (-8)] x (-6)

= 100 x (-1000) x (-6)

= -10000 x (-6)

=60000

Answer 4

\(c,\left(-40\right):8+3.\left(21-33\right)\)

\(=-5+3.\left(-12\right)=-5.\left(-36\right)\)

\(=5.36=180\)

\(d,\left(-4\right).125.\left(-25\right).\left(-6\right).\left(-8\right)\)

\(=100.125.\left(-6\right).\left(-8\right)\)

\(=100.\left(-1000\right).\left(-6\right)\)

\(=100.6000=600000\)

Answer 5

a) [( -52 ) + 18] . ( -7 )

=  [-34] . ( -7 )

= 238                           

b) ( 18 - 3 . 21 ) + ( -24 )

=  ( 18 - 63 ) + ( -24 )

=  -45  + ( -24 )

=  -69

c) ( -40 ) : 8 + 3 . ( 21 - 33 )

=  -5 + 3 . ( - 12 )

=  -5 + ( -36 )

=  -41                  

d) ( -4 ) . 125 . ( -25 ) . ( -6 ) . ( -8 )

= [ -4 . ( -25 )] . [125 . ( -8 )] . ( -6 )

= 100 . ( -1000 ) . ( - 6 )

= -100000 . ( -6 )

=  600000