Question

tính nhanh

a,49 x(37 +25) +62 x (121 - 70)

b,25x 38+ 146 x 19

 

Answer 1

a) =49x62+62x51

 =62x(49+51)

 =62x100

 =6200

b)còn câu b =3724 nha

Answer 2

a , 49 x ( 37 + 25 ) + 62 x ( 121 - 70 )

= 49 x 62 + 62 x 51

= 62 ( 49 + 51 )

= 62 x 100

= 6200

b , 25 x 38 + 146 x 19

= 25 x 38 + 73 x 2 x 19

= 25 x 38 + 73 x 38

= 38 ( 25 + 73 )

= 38 x 98

= 3724