a)=49x(27+61+12)+100x51
=49x100+5100
=4900+5100
=10000
b)=7236:36
=201
k nha p
a, 27 . 49 + 61 . 49 + 49 . 12 + 100 . 51
= 27 . 49 + 61 .49 + 12 . 49 + 100 . 51
= ( 27 + 61 + 12 ) . 49 + 100 . 51
= 100 . 49 + 100 . 51
= 100 . ( 49 + 51 )
= 100 . 100
= 10000
b, ( 7200 + 36 ) : 36
= 7200 + 36 : 36 + 1
= 7200 + 1 + 1
= 7202
a) 27.49+61.49+49.12+100.51
=49.(27+61+12)+5100
=4900+5100
=10000
b) ( 7200+36 ) : 36
=7236:36
=201
a, 27 . 49 + 61 . 49 + 49 . 12 + 100 . 51
= 27 . 49 + 61 .49 + 12 . 49 + 100 . 51
= ( 27 + 61 + 12 ) . 49 + 100 . 51
= 100 . 49 + 100 . 51
= 100 . ( 49 + 51 )
= 100 . 100
= 10000
b, ( 7200 + 36 ) : 36
= 7236 : 36
= 201