Задание 3 Контрольная работа 12 по учебнику Нурка ГДЗ Дидактические материалы Чесноков 6 класс (Математика)

$$-19{,}04:5{,}6=-(19{,}04:5{,}6)=-3{,}4$$

$$25{,}344:(-3{,}6)=25{,}344:3{,}6=7{,}04$$

$$1\tfrac{1}{8}:\left(-3\tfrac{3}{8}\right)=-\left(\tfrac{9}{8}:\tfrac{27}{8}\right)=-\left(\tfrac{9}{8}\cdot\tfrac{8}{27}\right)=-\tfrac{1}{3}$$

$$15{,}54:(-4{,}2)-2{,}5\cdot1{,}4+1{,}08=-7{,}6$$

$$0{,}4(x-3)=0{,}5(4+x)-2{,}5$$

$$0{,}4x-1{,}2=2+0{,}5x-2{,}5$$

$$0{,}4x-1{,}2=0{,}5x-0{,}5$$

$$0{,}5x-0{,}4x=-1{,}2+0{,}5$$

$$0{,}1x=-0{,}7$$

$$x=-0{,}7:0{,}1=-7$$

$$5{,}96-1{,}8m=4{,}7-2{,}7m$$

$$2{,}7m-1{,}8m=4{,}7-5{,}96$$

$$0{,}9m=-1{,}26$$

$$m=-1{,}26:0{,}9=-1{,}4$$

$$\left(5y-7\right)\left(2y-0{,}4\right)=0$$

$$5y-7=0 \quad \text{или} \quad 2y-0{,}4=0$$

$$y=\frac{7}{5}=1{,}4 \quad \text{или} \quad y=0{,}4:2=0{,}2$$

Ответ: $$-3{,}4$$; $$7{,}04$$; $$-\frac{1}{3}$$; $$-7{,}6$$; $$x=-7$$; $$m=-1{,}4$$; $$y=0{,}2$$, $$y=1{,}4$$.