Question

tính hợp lí

(-12).47 + (-12).52 + (-12)

13.(23+22)- 3.(17+28)

Answer 1

( -12 ).47 + ( - 12 ).52 + ( -12 ) 

= ( -12 ).( 47 + 52 + 1 ) 

= ( -12 ).100

= -1200

13.(23 + 22 ) - 3.( 17 + 28 ) 

= 13.45 - 3.45

= 45.(13 - 3 ) 

= 45.10

=450

Answer 2

(-12).47 + (-12).52 + (-12)

= (-12).47 + (-12).52 + (-12).1

= (-12) . ( 47+52+1)

= (-12) .100

= -1200.

Answer 3

(-12).47+(-12).52+(-12)

=(-12).(47+52+1)

=-1200

13.(23+22)-3.(17+28)

=13.45-3.45

=45.(13-3)

=450

happy new year

Answer 4

a)(-12).47 + (-12).52 + (-12)

=(-12).(47 + 52 + 1)

=(-12).100

=-1200

b)13.(23+22)-3.(17+28)

=13.45 - 3.45

=(13 - 3).45

=10.45

=450

Answer 5

(-12).47+(-12).52+(-12) =(-12).(47+52+1) =(-12).100 =-1200 13.(23+22)-3.(17+28) =13.45-3.45 =45.(13-3) =45.10 =450 =

Answer 6

( -12 ).47 + ( - 12 ).52 + ( -12 ) 

= ( -12 ).( 47 + 52 + 1 ) 

= ( -12 ).100

= -1200

13.(23 + 22 ) - 3.( 17 + 28 ) 

= 13.45 - 3.45

= 45.(13 - 3 ) 

= 45.10

=450