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=9/2+13/4-11/4+23/10+27/10
=9/2+(13/4-11/4)+(23/10+27/10)
=9/2+1/2+5
=9/2+1/2+10/2
=10
a, y + y : 0, 5 + y : 0,25 = 1,05
y x 1 + y x 2 + y x 4 = 1,05
y x ( 1 + 2 + 4 ) = 1,05
y x 7 = 1,05
y = 1,05 : 7
y = 0,15
a) \(x+\frac{1}{5}-\frac{2}{7}=4\frac{1}{2}\)
=> \(x+\frac{1}{5}-\frac{2}{7}=\frac{9}{2}\)
=> \(x=\frac{9}{2}+\frac{2}{7}-\frac{1}{5}=\frac{321}{70}\)
b) \(1\frac{3}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x=\frac{47}{8}\)
=> \(x=\frac{33}{8}\)
c) \(\frac{1}{2}-\frac{1}{3}\cdot x=\frac{3}{4}\)
=> \(\frac{1}{3}\cdot x=\frac{1}{2}-\frac{3}{4}=-\frac{1}{4}\)
=> \(x=\left(-\frac{1}{4}\right):\frac{1}{3}=\left(-\frac{1}{4}\right)\cdot3=-\frac{3}{4}\)
`450%+3 1/4 -2,75+ 2 3/10 +2,7`
`->4,5+3,25−2,75+2,3+2,7`
`->[(4,5+3,25)−2,75]+(2,3+2,7)`
`->[7,75-2,75]+5`
`->5+5->10`
\(=\dfrac{9}{2}+\dfrac{13}{4}-\dfrac{11}{4}+\dfrac{23}{10}+\dfrac{27}{10}\\ =\dfrac{9}{2}+\dfrac{1}{2}+5\\ =5+5=10\)