= ( 21 + 29) + ( 23 + 27 )
= 50 + 50
= 100
=(21+29)+(23+27)
=50+50
=100
ai k mình mình k lại cho
21 + 23 + 29 + 27
= { 21 + 29 } + { 23 + 27 }
= 50 + 50
= 100
dễ quá hihi
\(21+23+29+27\)
\(=\left(21+29\right)+\left(23+27\right)\)
\(=50+50\)
\(=100\)
21+23+29+27=(21+29)+(23+27)=50+50=100
tk cho mk nh
~~~
( 21+23) + (23+27)
= 50 + 50
= 100