Răspuns:

Explicație pas cu pas:

a)

[tex]\frac{\frac{40}{2} +18}{2} -(2\times3-5)=\\\\=\frac{20 +18}{2} -(6-5)=\frac{38}{2} -1=\\\\=19-1=18[/tex]

b)

[tex]\frac{8+\frac{16}{2} }{4} -1=\\\\=\frac{8+8 }{4} -1=\frac{16 }{4} -1=\\\\=4-1=3[/tex]