Оценки (см. рис.):
"пятерка" - (2;4) (-2;4) (-2;0) (1;0) (2;-3) (1;-6) (-2;-6) (-3;-5)
"четверка" - (-2;4) (-2;-1) (0;-2) (2;-1) (2;4) (2;-6)
"тройка" - (-2;3) (-1;4) (1;4) (3;1) (1;-1) (3;-3) (1;-6) (-1;-6) (-2;-5)
"двойка" - (-2;3) (0;4) (2;3) (2;0) (-2;-5) (3;-5)
"единица" - (-2;0) (1;4) (1;-5) (-2;-5) (4;-5)
![-15x-3(2-3x)+18=-(4x+2) \\ -15x-(6-9x)+18=-(4x+2) \\ -15x-6+9x+18=-4x-2 \\ -6x+12=-4x-2 \\ -6x+4x=-2-12 \\ -2x=-14 \\ x=7](https://tex.z-dn.net/?f=-15x-3%282-3x%29%2B18%3D-%284x%2B2%29+%5C%5C+-15x-%286-9x%29%2B18%3D-%284x%2B2%29+%5C%5C+-15x-6%2B9x%2B18%3D-4x-2+%5C%5C+-6x%2B12%3D-4x-2+%5C%5C+-6x%2B4x%3D-2-12+%5C%5C+-2x%3D-14+%5C%5C+x%3D7)
![-\frac{2}{3}*1,5-0,5+2*(1\frac{1}{2})^2+1:\frac{1}{4} \\ \\ 1) -\frac{2}{3}*1,5=-\frac{2}{3}* \frac{3}{2} =-1 \\ \\ 2) -1-0,5=-1,5 \\ \\ 3) 2*(1\frac{1}{2})^2=2*(\frac{3}{2})^2=2*\frac{9}{4}=\frac{9}{2}=4,5 \\ \\ 4) -1,5+4,5=3 \\ \\ 5) 1:\frac{1}{4}=1*4=4 \\ \\ 6) 3+4=7](https://tex.z-dn.net/?f=-%5Cfrac%7B2%7D%7B3%7D%2A1%2C5-0%2C5%2B2%2A%281%5Cfrac%7B1%7D%7B2%7D%29%5E2%2B1%3A%5Cfrac%7B1%7D%7B4%7D+%5C%5C+%5C%5C+1%29+-%5Cfrac%7B2%7D%7B3%7D%2A1%2C5%3D-%5Cfrac%7B2%7D%7B3%7D%2A+%5Cfrac%7B3%7D%7B2%7D+%3D-1+%5C%5C+%5C%5C+2%29+-1-0%2C5%3D-1%2C5+%5C%5C+%5C%5C+3%29+2%2A%281%5Cfrac%7B1%7D%7B2%7D%29%5E2%3D2%2A%28%5Cfrac%7B3%7D%7B2%7D%29%5E2%3D2%2A%5Cfrac%7B9%7D%7B4%7D%3D%5Cfrac%7B9%7D%7B2%7D%3D4%2C5+%5C%5C+%5C%5C+4%29+-1%2C5%2B4%2C5%3D3+%5C%5C+%5C%5C+5%29+1%3A%5Cfrac%7B1%7D%7B4%7D%3D1%2A4%3D4+%5C%5C+%5C%5C+6%29+3%2B4%3D7)
1 сторона прямоугольника - х
2 сторона прямоугольника - (х+4)
Р=25
![P=2(a+b) \\ \\ 2(x+x+4)=25 \\ 2(2x+4)=25 \\ 4x+8=25 \\ 4x=25-8 \\ 4x=17 \\ x=4,25 \\ \\ x+4=4,25+4=8,25](https://tex.z-dn.net/?f=P%3D2%28a%2Bb%29+%5C%5C++%5C%5C+%0A2%28x%2Bx%2B4%29%3D25+%5C%5C+%0A2%282x%2B4%29%3D25+%5C%5C+%0A4x%2B8%3D25+%5C%5C+%0A4x%3D25-8+%5C%5C+%0A4x%3D17+%5C%5C+%0Ax%3D4%2C25+%5C%5C++%5C%5C+%0Ax%2B4%3D4%2C25%2B4%3D8%2C25)
1 сторона квадрата - (х+4)-6,5
2 сторона квадрата - (х+4)-6,5
Р-?
![(x+4)-6,5=(4,25+4)-6,5=8,25-6,5=1,75 \\ P=2(1,75+1,75)=2*3,5=7](https://tex.z-dn.net/?f=%28x%2B4%29-6%2C5%3D%284%2C25%2B4%29-6%2C5%3D8%2C25-6%2C5%3D1%2C75+%5C%5C+P%3D2%281%2C75%2B1%2C75%29%3D2%2A3%2C5%3D7)
ответ: периметр квадрата равен 7 см.
11:4=2,75 см сторона квадрата
1) 18*10=180 л = 180 000 см³ объем воды
2) v=abc , c=v/a/b=180 000 / 80/40=56,25 cм
2 км700 м*4=10км 800м
2700м*4=10800м