Question

1.Tính hợp lí:

a) 17.[29 - (-111)] + 29.(-17)

b) 19.43 + (-20).43 - (-40)

c) 17.(-84) + 17.(-16)

d) 15.(-58) - 15.(-48)

Answer 1

a: \(=17\left(29+111-29\right)=17\cdot111=1887\)

b: \(=43\left(19-20\right)+40=-43+40=-3\)

c: \(=17\left(-84-16\right)=17\cdot\left(-100\right)=-1700\)

d: \(=15\left(-58+48\right)=-15\cdot10=-150\)

Answer 2

a) 17.[29 - (-111)] + 29.(-17) 

= 17(29+111-29)

= 17.111=1887.

b) 19.43 + (-20).43 - (-40) 

= 43(19-20)+40

=-43+40

=-3.

c) 17.(-84) + 17.(-16) 

=17(-84-16)

=17.(-100)

=-1700.

d) 15.(-58) - 15.(-48) 

=15(-58+48)

=-15.10

=-150.