Question

Алгебра 7 класс 12.1 12.2 12.3 чётные

Answer 1

12.1

1) $2x^{2}$ +1

2)y+2x+6

3)3ab+9

4)23,8$a^{2}$ + $y^{3}$

12.2

1)41-89$a^{3}$

2)85+29mn

3)21b+7$c^{2}$

4)13,2kt+2,2z

13.2

1)27x+13y

2)9b-5a

3)-0,5m-7,2n

4)1,9k+8,8t

5)$\frac{1}{16}$ a - 9b

6)$\frac{7}{15}$ a +113d - $\frac{13}{15}c$

Объяснение:

12.3

1)(4x+8y)+(23x+5y) = 4x+8y+23x+5y = 27x+13y

2) (83a-91b) - (89a-100b) = 83a-91b-89a+100b = -5a+9b = 9b-5a

3) (1,5m - 4,2n) - (2m+3n) = 1,5m - 4,2n - 2m - 3n = -0,5m-7,2n

4) (5k+6t)+(2,8t-3,1k) = 5k+6t+2,8t-3,1k = 1,9k+8,8t

5) $(\frac{3}{16} a-20b) + (11b-\frac{1}{16} a)$ = $\frac{3}{16} a-20b + 11b-\frac{1}{16} a$ = $\frac{1}{16}$ a - 9b

6) $(\frac{7}{15} q+53d)+(60d-\frac{13}{15} c) = \frac{7}{15} q+53d+60d-\frac{13}{15} c$ = $\frac{7}{15}$ a +113d - $\frac{13}{15}c$