Question

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Answer 1

a: \(S=\dfrac{14+8}{2}\cdot5=11\cdot5=55\left(m^2\right)\)

b: \(S=\dfrac{40+26.4}{2}\cdot18=66.4\cdot9=597,6\left(cm^2\right)\)

Answer 2

Bài 2 :

\(a,S:\dfrac{\left(14+8\right)\times5}{2}=55\left(m^2\right)\\ b,4dm=40cm\\ S=\dfrac{\left(40+26,4\right)\times18}{2}=597,6\left(cm^2\right)\)

Answer 3

 a,S:(14+8)×52=55(m2)b,4dm=40cmS=(40+26,4