Помогите решить пожалуйста 10 баллов дам спасибо

№1
1) 5? * 5? = 5??
2) 2?: 2? = 2?
3) (3?)? = 3?
4) 4? * 7? = (4 * 7)? = 28?
5) (х?)?: х? = х??: х? = х?

№2
1) (5m?y? + 3m?y? -m) — (3m?y? +2m + 3m?y?) =
= 5m?y? + 3m?y? — m — 3m?y? — 2m — 3m?y? = 2m?y? — 3m
2) 3x? (b + 2x) — 2x(2b?x + x?) = 3x?b + 6x? - 4x?b? — 2x? =
= 3x?b — 4x?b? + 4x? = x?(3b — 4b? + 4x) = x?(b(3 — 4b) + 4x)

№3
1) (-0.7a?b?c?)(-1.8a?bc?) = 1.26(abc)?
2) $(2 m^{2}+ \frac{3}{5} n )( \frac{3}{5} n-2 m^{2} )=( \frac{3}{5}n ) ^{2} -(2m ^{2} ) ^{2} = \frac{9}{25}n ^{2} -4m ^{4}$
3) (18x?y? — 12x?y): (6x?y) = 3y? — 2x

№4
(b? — b?)(b? + b?) — (1 + b?)(1 — b? + b?) = b? — b? — 1 + b? — b? — b? + b? — b? =
= — 1 — b? = -(1 + b?)
— (1 + 0.1?) = — (1 + 0,0001) = — 1,0001

№5
х(х + 2) — (х + 3)(х + 1) = 2х + 3
х? + 2х — х? — х — 3х — 3 = 2х + 3
— х — 3х — 3 = + 3
4х = — 6
х = — 1,5
Ответ: — 1,5.