Question

sabendo que a= 2-³ e b =3-² calcule:

a+b=

a-b=

(a×b)²=

a÷b=

a×b=

gente me ajudem por favor

Answer 1

a = 2-³ = 1/(2³) = ⅛; b = 3-² = (1/3²) = 1/9

a + b = ⅛ + 1/9 = 17/72
a - b = ⅛ - 1/9 = 1/72
(a.b)² = ((⅛).(1/9))² = (1/72)² = 1/5184
(a/b) = ((⅛)/(1/9)) = 9/8
(a.b) = 1/72

Answer 2

a+b=
a = 2⁻³ = 1/2³ = 1/8    b = 3⁻² = 1/3² = 1/9

a - b= 1/8 - 1/9 =

mmc: 72

(1.9 - 1.8)/72 = (9 - 8)/72 = 1/72

(a×b)²= (1/8 x 1/9)² = (1/72)² = 1/5184

a÷b= (1/8 ÷ 1/9) = 1/8 x 9/1 = 9/8

a×b= 1/8 x 1/9 = 1/72