a) 36.2+36.3+36.5=36.(2+3+5)=36.10=360
b) 201+201.2+201.3+201.4=201.(1+2+3+4)=201.10=2010
Dấu . là nhân nhé
a ) 36 x 2 + 36 x 3 + 36 x 5
= 36 x ( 2 + 3 + 5 )
= 36 x 10
= 360
b ) 201 + 201 x 2 + 201 x 3 + 201 x 4
= 201 x 1 + 201 x 2 + 201 x 3 + 201 x 4
= 201 x ( 1 + 2 + 3 + 4 )
= 201 x 10
= 2010