А)а=7 1/7
б)а=1 1/1=1
в)а=13 1/13
г)а=2/5 1:2/5=5/2
д)а=-1/200 1:(-1/200)=-200
x=1; x=2; x=5;
y=-5; y= -2,5;y=-1;
думаю столько хватит
![1)3xy + 3x - 4 - 4y \\ 3x \times (y + 1) - 4(1 + y) \\ (y + 1)(3x - 4) \\ \\ 2)49n {}^{2} - (3n + 1) \\ 49n { }^{2} - 3n - 1](https://tex.z-dn.net/?f=1%293xy+%2B++3x+-+4+-+4y+%5C%5C+3x+%5Ctimes+%28y+%2B+1%29+-+4%281+%2B+y%29+%5C%5C+%28y+%2B+1%29%283x+-+4%29+%5C%5C++%5C%5C+2%2949n+%7B%7D%5E%7B2%7D++-+%283n+%2B+1%29+%5C%5C+49n+%7B+%7D%5E%7B2%7D++-+3n+-+1)
2)Когда перед скобками есть знак "-" знак каждого члена в скобках нужно изменить на противоположный
- 0,2 * ( - 10 )^2 = - 0,2 * 100 = - 20
- 20 + 55 = 35
Ответ 35
4 задание с умовой и решением
1)
![{x}^{2} + 10x + 25 - 16 = {x}^{2} + 9x + x + 9 = (x + 1) \times (x + 9)](https://tex.z-dn.net/?f=+%7Bx%7D%5E%7B2%7D++%2B+10x+%2B+25+-+16+%3D++%7Bx%7D%5E%7B2%7D+%2B+9x+%2B+x+%2B+9+%3D+%28x+%2B+1%29+%5Ctimes+%28x+%2B+9%29)
2)
![81 - {m}^{2} + 14m - 49 = 32 - {m}^{2} + 14m = - {m}^{2} + 14m + 32 = - {m}^{2} + 16m - 2m + 32 = ( - m - 2) \times (m - 16)](https://tex.z-dn.net/?f=81+-++%7Bm%7D%5E%7B2%7D+%2B+14m+-+49+%3D+32+-++%7Bm%7D%5E%7B2%7D+%2B+14m+%3D++-++%7Bm%7D%5E%7B2%7D+%2B+14m+%2B+32+%3D++-++%7Bm%7D%5E%7B2%7D+%2B+16m+-+2m+%2B+32+%3D+%28+-+m+-+2%29+%5Ctimes+%28m+-+16%29+)
5 задание с умовой и решение
1)
![{a}^{2} - a - {b}^{2} - b = (a - b) \times (a + b) - (a + b) = ((a - b) - 1) \times (a + b) = (a - b - 1) \times (a + b)](https://tex.z-dn.net/?f=+%7Ba%7D%5E%7B2%7D+-+a+-+%7Bb%7D%5E%7B2%7D+-+b+%3D+%28a+-+b%29+%5Ctimes+%28a+%2B+b%29+-+%28a+%2B+b%29+%3D+%28%28a+-+b%29+-+1%29+%5Ctimes+%28a+%2B+b%29+%3D+%28a+-+b+-+1%29+%5Ctimes+%28a+%2B+b%29)
2) Не смогла решить