Спрости вираз:
Розв'язок:
1) $(-0{,}7x + 0{,}6y) \cdot 5 - 3(0{,}4y - 1{,}5x - 1) - (2{,}7x - 8) =$
$= -0{,}7x \cdot 5 + 0{,}6y \cdot 5 - 3 \cdot 0{,}4y + 3 \cdot 1{,}5x + 3 - 2{,}7x + 8 =$
$= -3{,}5x + 3y - 1{,}2y + 4{,}5x + 3 - 2{,}7x + 8 =$
$= -1{,}7x + 1{,}8y + 11$;
2) $\frac{2}{9}\left(2{,}7 - 1\frac{1}{2}x\right) - 1\frac{1}{6}\left(1{,}8 - \frac{2}{7}x\right) =$
$= \frac{2 \cdot 27}{9 \cdot 10} - \frac{2 \cdot 3}{9 \cdot 2}x - \frac{7 \cdot 9}{6 \cdot 5} + \frac{7 \cdot 2}{6 \cdot 7}x =$
$= \frac{3}{5} - \frac{1}{3}x - \frac{21}{10} + \frac{1}{3}x =$
$= \frac{6-21}{10} = \frac{-15}{10} = -1{,}5$.