a ) 35 + 21 + 49

= 35 + ( 21 + 49 )

= 35 + 70

= 105

b ) 63 + 21 + 49

= 63 + ( 21 + 49 )

= 63 + 70

= 133

1) My little brother usually eats candy at night without brushing his teeth. Maybe he will have a toothache.

2) Which activity uses more calories: walking or riding a bicycle?

3) Minh likes watching horror film because it is his hobby.

4) Do you enjoy playing football or watching football match on TV more?

số các số hạng:(126-24):1+1

                      = 102+1

                     =103 số hạng

tổng :103x (24+126):2

     =  103x150:2

      =15450:2

      =7725

Bn ơi chỗ 3,027 fai là 3,072 ms tính nhanh đc nhé

69,28 x 3,527 + 35,27 x 3,072

= 6,928 x 10 x 3,527 + 35,27 x 3,072

= 6,928 x 35,27 + 35,27 x 3,072

= 35,27 x (6,928 + 3,072)

= 35,27 x 10

= 352,7

3+4=7

toan lop 6 ha ban lop 1 con lam duoc la sao