а)a) n5*n2 = n7n5:n2 = n3(n5)2 = n10(n2)5 = n10
б)(nk)2 = n2knk*n2 = n(k+2)nk:n2 = n(k-2)(n2)k = n2k
а)(a-1)(a+1) + a(a-2) = a^2 - a + a - 1 + a^2 - 2a= 2a^2 - 3a - 1
б)(2x-y)(y+2x) + x(4-3x) = 2x(y+2x) - y(y+2x) + 4x - 3x^2= 2xy + 4x^2 - y^2 - 2xy + 4x - 3x^2= x^2 - y^2 + 4x - 3x^2
а)
a) n5*n2 = n7
n5:n2 = n3
(n5)2 = n10
(n2)5 = n10
б)
(nk)2 = n2k
nk*n2 = n(k+2)
nk:n2 = n(k-2)
(n2)k = n2k
а)
(a-1)(a+1) + a(a-2) = a^2 - a + a - 1 + a^2 - 2a
= 2a^2 - 3a - 1
б)
(2x-y)(y+2x) + x(4-3x) = 2x(y+2x) - y(y+2x) + 4x - 3x^2
= 2xy + 4x^2 - y^2 - 2xy + 4x - 3x^2
= x^2 - y^2 + 4x - 3x^2