Получается 135!
150:100*25=37.5
150-37.5=112.5(после уменьшения на 25\%)
112.5:100*20=25.5
112.5+25.5=135
25.12 : 2 = 12.56 -центр кола
12.56х3.14 =39.4
1)
![340.607=3*10^{2}+4*10^{1}+6*10^{-1}+7*10^{-3}](https://tex.z-dn.net/?f=340.607%3D3%2A10%5E%7B2%7D%2B4%2A10%5E%7B1%7D%2B6%2A10%5E%7B-1%7D%2B7%2A10%5E%7B-3%7D)
Это если точка - отделение десятичной части. Если точка - это разделение классов, то:
![340.607=3*10^{5}+4*10^{4}+6*10^{2}+7*10^{0}](https://tex.z-dn.net/?f=340.607%3D3%2A10%5E%7B5%7D%2B4%2A10%5E%7B4%7D%2B6%2A10%5E%7B2%7D%2B7%2A10%5E%7B0%7D)
2)
![2.204.570=2*10^{6}+2*10^{5}+4*10^{3}+5*10^{2}+7*10^{1}](https://tex.z-dn.net/?f=2.204.570%3D2%2A10%5E%7B6%7D%2B2%2A10%5E%7B5%7D%2B4%2A10%5E%7B3%7D%2B5%2A10%5E%7B2%7D%2B7%2A10%5E%7B1%7D)
3)
![39.061.009=3*10^{7}+9*10^{6}+6*10^{4}+1*10^{3}+9*10^{0}](https://tex.z-dn.net/?f=39.061.009%3D3%2A10%5E%7B7%7D%2B9%2A10%5E%7B6%7D%2B6%2A10%5E%7B4%7D%2B1%2A10%5E%7B3%7D%2B9%2A10%5E%7B0%7D)
4)
![506.002.003=5*10^{8}+610^{6}+2*10^{3}+3*10^{0}](https://tex.z-dn.net/?f=506.002.003%3D5%2A10%5E%7B8%7D%2B610%5E%7B6%7D%2B2%2A10%5E%7B3%7D%2B3%2A10%5E%7B0%7D)
Р=а+в+с
99=х+х-7+(х-7)×2
99=х+х+2х-7-14
99=4х-21
4х=21+99
4х=120
х=120÷4
х=30(а)
30-7=23(в)
23×2=46(с)