Question

50 - 20 + 20

Answer 1

10

Answer 2

50

Answer 3

cách 1

= 30 + 20

= 50

cách 2

= 50 + 20

= 70

Answer 4

=50

Answer 5

\(50-20+20=30+20=50\)

Answer 6

50-20 = 30 + 20 = 50

Answer 7

Answer 8

10

Answer 9

50-20+20

=50-40

=10

đây nhé em

Answer 10

10

Answer 11

50

Answer 12

=50

Answer 13

50

Answer 14

50-20+20=30+20=50

Answer 15

20+20=40

50-40=10 (o^o)

Answer 16

50

Answer 17

10

Answer 18

50 - 20 + 20 = 50 + ( 20 - 20 ) = 50

(nhân chia trước, cộng trừ sau)

Answer 19

50

Answer 20

50 - 20 + 20 = 50

Answer 21

50-20+20=30+20

                 =50