Question

35×18—9×70+100

[1+2+3+....+2016]×[13×15—15×12—15]

2 câu hoi nha 

 

Answer 1

35x18 - 9x70+100

= 35x 9x 2 - 9 x 2 x35 + 100

= 0 +100

= 0 

[1+2+3+....+2016]×[13×15—15×12—15]

=[ 1+2+3+....+2016] x  [ 15 x( 13-12 - 1)]

= [ 1+2+3+...+2016] x [ 15x 0]

= [ 1+2+3+....+2016 ] x 0

= 0 

Answer 2

35.18-9.70+100

=35.2.9-9.70+100

=70.9-9.70+100

=0+100=100

(1+2+3+4+...+2016).(13.15-15.12-15)

=(1+2+3+...+2016).[13.15-(15.12+15)]

=(1+2+3+...+2016).[13.15-15.13]

=(1+2+3+...+2016).0=0

dau . la dau x do ban