Question

tính nhanh :  1+1+1+1+2+2+2+2+3+3+3+3+4+4+4+4 =

Answer 1

1 + 1 + 1 + 1 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 4 + 4 + 4 + 4

= ( 1 + 2 + 3 + 4 ) x 4

=         10          x   4

=                  40

nhớ nak , ko thj mk buồn lắm đó !

Answer 2

{ 1+2+3+4} x 4 = 40

Answer 3

1 + 1 + 1 + 1 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 4 + 4 + 4 + 4 

= 1 x 4 + 2 x 4 + 3 x 4 + 4 x 4

= 4 + 8 + 12 + 16

= 30

Answer 4

\(1+1+1+1+2+2+2+2+3+3+3+3+4+4+4+4\)
\(=\left(1\times4\right)+\left(2\times4\right)+\left(3\times4\right)+\left(4\times4\right)\)
\(=4+8+12+16\)
\(=\left(4+16\right)+\left(8+12\right)\)
\(=20+20\)
\(=20\times2\)
\(=40\)

Answer 5

kb với mình nhé