Ответы
Ответ дал:
0
№1
1)
![1 frac{1}{2} x-2 frac{1}{5} =12.8-3.5x 1 frac{1}{2} x-2 frac{1}{5} =12.8-3.5x](https://tex.z-dn.net/?f=1+frac%7B1%7D%7B2%7D+x-2+frac%7B1%7D%7B5%7D+%3D12.8-3.5x)
![1.5x-2.2=12.8-3.5x 1.5x-2.2=12.8-3.5x](https://tex.z-dn.net/?f=1.5x-2.2%3D12.8-3.5x)
![1.5x+3.5x=12.8+2.2 1.5x+3.5x=12.8+2.2](https://tex.z-dn.net/?f=1.5x%2B3.5x%3D12.8%2B2.2)
![5x=15 5x=15](https://tex.z-dn.net/?f=5x%3D15)
![x=15:5 x=15:5](https://tex.z-dn.net/?f=x%3D15%3A5)
![x = 3 x = 3](https://tex.z-dn.net/?f=x+%3D+3)
2)
![(4.1x+2.5)-(2.3x+3.9)=1.6x (4.1x+2.5)-(2.3x+3.9)=1.6x](https://tex.z-dn.net/?f=%284.1x%2B2.5%29-%282.3x%2B3.9%29%3D1.6x)
![4.1x+2.5-2.3x-3.9-1.6x=0 4.1x+2.5-2.3x-3.9-1.6x=0](https://tex.z-dn.net/?f=4.1x%2B2.5-2.3x-3.9-1.6x%3D0)
![0.2x=3.9-2.5 0.2x=3.9-2.5](https://tex.z-dn.net/?f=0.2x%3D3.9-2.5)
![0.2x=1.4 0.2x=1.4](https://tex.z-dn.net/?f=0.2x%3D1.4)
![x = 1.4:0.2 x = 1.4:0.2](https://tex.z-dn.net/?f=x+%3D+1.4%3A0.2)
![x = 7 x = 7](https://tex.z-dn.net/?f=x+%3D+7)
№2
![x-10=2x-30 x-10=2x-30](https://tex.z-dn.net/?f=x-10%3D2x-30)
![x-2x=-30+10 x-2x=-30+10](https://tex.z-dn.net/?f=x-2x%3D-30%2B10)
![-x=-20 -x=-20](https://tex.z-dn.net/?f=-x%3D-20)
![x = 20 x = 20](https://tex.z-dn.net/?f=x+%3D+20)
Ответ: 20 стульев было в 1-ом кабинете.
1)
2)
№2
Ответ: 20 стульев было в 1-ом кабинете.
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