Question

21+21+3+2+1

Answer 1

21 + 21 + 3 + 2 + 1

= (21+3) + (21+1+2)

=  24 + 24

= 24 x 2 

= 48

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Answer 2

21 + 21 + 3 + 2 + 1 = 48 

Answer 3

21+21+3+2=47

Answer 4

21+21+3+2+1

=21.2+3+2+1

=42+3+2+1

=45+2+1

=47+1

=48

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Answer 5

21 + 21 + 3 + 2 + 1 = 48

k minh nhe