\(=\left(\dfrac{1}{4}\times2+\dfrac{1}{4}\times3+\dfrac{1}{4}\times5\right)\times\left(\dfrac{3}{4}+\dfrac{1}{4}\right)-\left(\dfrac{13}{20}+\dfrac{7}{20}\right)\)
\(=\left[\dfrac{1}{4}\times\left(2+3+5\right)\right]\times\dfrac{4}{4}-\dfrac{20}{20}\)
\(=\dfrac{10}{4}\times\dfrac{4}{4}-1=\dfrac{5}{2}-1=\dfrac{5}{2}-\dfrac{2}{2}=\dfrac{3}{2}\)
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= ( 1/4 x 2 + 0,25 x 3 + 0,25 x 5 ) x ( 0,75 + 1/4 ) - ( 0,65 + 0,35 )
= ( 0,25 x 4 ) + ( 0,25 x 4 ) + ( 0,25 + 0,75 ) + ( 0,65 + 0,35 ) + ( 3 x 5 )
= 1 + 1 + 1 + 1 + 15
= 19
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