Question

cele doua ex va rog mult

Answer 1

Răspuns

Explicație pas cu pas:

AC = a + b

AD = a + b + c

BD = b + c

_______

(a + b + c) - (b + c) = a + b + c - b - c = a

(a + b + c) - (a + c) = a + b + c - a - c = b

(a + b + c) - (a + b) = a + b + c - a - b = c

a + (b + c) - (a + b) = a + b + c - a - b = c

(a + b) + (b + c) + (c + a) - (a + b + c) = a + b + b + c + c + a - a - b - c = a + b + c

________________

x*x*x*x = x^4

x^2 * x^3 * x = x^6

y^3 * y^-5 = y^-2

y^-7 * y^4 * y^2 = y^-1

z^3 : z^2 : z = z : z = z^0 = 1

z^-7 : z^-4 : z^2 = z^-3 : z^2 = z^-5

(-2a)^3 = -8a^3

-(1/2a^3b^2)^5 = - a^15b^10 / 2^5

(-3a^2)(a^-2/6) = -3/6 = -1/2

x^2/2 *x^3/3 = (x^5)/6

(a^5)^-1 * a^4/a^-1 = a^-5 * a^5 = a^0 = 1