1) ............=64a³+16m²n+4/3 mn²+1/27 n³
2) .............=8/27 x³-4x²y+18xy² - 27y³
3) ............=1/27 a³+1/6a²b+1/4ab²+1/8 b³
4) ............=1/216 x³+1/6 x²y+2xy²+8y³
5) ............=0.008x³ - 0.6x²y+15xy² - 125y³
6) ............=8a³ - 7.2a²b+2.16ab² - 0.216b³
7) ............=0.001m³ - 0.12m²n+4.8mn² - 64n³
8) ............=0.125a³+0.12a²+0.0384a+0.004096
1. 2x - 8 = 4
2x = 12
x = 6
2. 45 - 3x = 22
3x = 23
x = 23/3 = 7 2/3
3. 50 - 5x = 30
5x = 20
x = 4
4. 56/(x-1) = 7
56 = 7x - 7
7x = 63
x = 9
5. (x + 4)3 = 27
x + 4 = 9
x = 5
6. 3 - 2x = 1
2x = 2
x = 1
7. 48/(x+6) = 6
48 = 6x + 36
6x = 12
x = 2
8. 6 - x = 1
x = 5
9. x/7 = 9
x = 63
10. (8 + x)3 = 30
8 + x = 10
x = 2
11. 15 + 2x = 17
2x = 2
x = 1
12. x/7 = 9
x = 63
13. (9 - x)/6 = 36
9 - x = 216
x = -207
14. x/11 = 2
x = 22
15. 15 + 3x = 12
3x = -3
x = -1
16. 9 - 5x = 4
5x = 5
x = 1
1-4/9=5/9-мальчики
а)1-3/5=2/5 всех мальчиков не посещают секции
2/5*5/9=2/1*1/9=2/9 всего класса составляют мальчики,не посещающие секции
б)8:2/9=8*9/2=4*9=36 <span>учащихся в классе</span>
Использована формула площади трапеции