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\(a.\frac{3}{28}\)

\(b.\frac{9}{5}\)

=6\(cm^2\)nha bạn

Lan đúng

(2+50)\(\times\)50:2=2550 

1+1+1+1+1=5

Cạnh của hình vuông là:

104:4 = 26 ( cm )

Chiều dài hình chữ nhật là:

26+2 = 28 ( cm )

      Đáp số : 28 cm

k mik nhak 

chúc bn học giỏi