Question

Bài 3: Thực hiện phép tính ( bằng cách hợp lí nếu có thể)

a) 2015 – [(-2014)+2013 – (-2014)] b)(-2016).97+2016.(-13)

c) (-25).125.2².2³ e) 5⁴ .(-4)²

d) (-75) - (-25 -75) h) 2017+ [(-4032) : 2+(-1)]

f) 127 - 18.( 5 - 6) k) x= -5

Answer 1

d)=(-75)+25+75

= 0+25=25

Answer 2

b)(-2016).97+2016.(-13)

= 2016.(-97)+2016.(-13)

=2016.(-97-13)

=2016.(-100)

=-201600

Answer 3

a) 2015 – [(-2014)+2013 – (-2014)]

=2015-{[(-2014)+2014]+2013}

=2015-{0+2013}

=2015-2013

=2

b)(-2016).97+2016.(-13)

=-2016.[97-(-13)]

=-2016.110

=-221760

c) (-25).125.2².2³

=(-25).5³.4.2³

=(-25).4.1000

=-100.1000

=-100000

e) 5⁴ .(-4)²

=625.16

=10000

d) (-75) - (-25 -75)

=(-75)-(-100)

=25

h) 2017+ [(-4032) : 2+(-1)]

=2017+[-2016+(-1)]

=2017+(-2017)

=0

f) 127 - 18.( 5 - 6)

=127-18.(-1)

=127-(-18)

=145