Question

Решите эту фоточку , плес.
Срочно надо, даю 80б

Answer 1

$2)a)5x - 2y \\ b)5x \times 2y = 10xy \\ v)(5x \times 2y) \times 2 = 20xy$
Г)
$(5x + 2y) {}^{2} = 25 {x}^{2} + 20xy + 4 {y}^{2}$
Д)
$(5x - 2y) {}^{2} = 25 {x}^{2} - 20xy + 4 {y}^{2}$
3.
а)
${y}^{2} + 6y + 9$
Б)
${m}^{2} - 2mn + {n}^{2}$
В)
${x}^{2} - 14x + 49$
Г)
$81 + 18b + {b}^{2}$
Д)
$64 - 16x + {x}^{2}$
Е)
${y}^{2} - 22y + 121$
Ж)
$25 {a}^{2} + 10a + 1$
З)
${9y}^{2} - 6ay + {a}^{2}$
И)
$4 {x}^{2} + 12mx + 9 {m}^{2}$

4.
$a) {102}^{2} = (100 + 2) {}^{2} = \\ 10000 + 400 + 4 = 10404$
Б)
$(100 - 4) {}^{2} = 10000 - 800 + 16 = \\ 9216$
В)
$(10 + 0.3) {}^{2} = 100 + 6 + 0.09 = \\ 106.09$
Г)
$(10 - 0.2) {}^{2} = 100 - 4 + 0.04 = \\ 96.04$
5.
$a)(n + 2b) {}^{2} = {n}^{2} + 4bn + {4b}^{2}$
Б)
$(c - 3a) {}^{2} = {c}^{2} - 6ca + 9 {a}^{2}$