Hvordan multiplicerer og forenkler du frac {x ^ {2} - 3x - 10} {x ^ {2} - 4x - 12} cdot frac {6- x} {x ^ {2} - 25}?

$Hvordan multiplicerer og forenkler du frac {x ^ {2} - 3x - 10} {x ^ {2} - 4x - 12} cdot frac {6- x} {x ^ {2} - 25}?$

Svar:

# -1 / (x + 5) #

Forklaring:

Først faktoriserer vi alt:

# ((X + 2) (x-5)) / ((x + 2) (x-6)) * (6-x) / ((x-5) (x + 5)) = ((x + 2) (x-5) (6-x)) / ((x + 2) (x-6) (x-5) (x + 5)) #

# (Annullere ((x + 2)) annullere ((x-5)) (6-x)) / (annullere ((x + 2)) (x-6) annullere ((x-5)) (x + 5)) = (6-x) / ((x-6) (x + 5)) #

# (6-x) = - (x-6) #

# (6-x) / ((x-6) (x + 5)) = - (x-6) / ((x-6) (x + 5)) = - 1 / (x + 5) #

Hvordan multiplicerer du uv ^ {6} w ^ {- 8} cdot u ^ {- 1} v ^ {0} w ^ {- 1} cdot u ^ {0} v ^ {9} w ^ {- 1}?

Uv ^ 6w ^ -8 * u ^ -1v ^ 0w ^ -1 * u ^ 0v ^ 9w ^ -1 = v ^ 15w ^ -10 Lad os tage det en variabel ad gangen: u ^ 1 * u ^ -1 * u ^ 0 = u ^ 0 = 1 v ^ 6 * v ^ 0 * v ^ 9 = v ^ 15 w ^ -8 * w ^ -1 * w ^ -1 = w ^ -10 Så der går du: uv ^ 6w ^ -8 * u ^ -1v ^ 0w ^ -1 * u ^ 0v ^ 9w ^ -1 = v ^ 15w ^ -10

Hvordan forenkler du [ frac {2} {9} cdot frac {3} {10} - {- frac {2} {9} div frac {1} {3})] - frac { 2} {5}?

1/3 [2/9*3/10-(-2/9-:1/3)]-2/5 =[6/90-(-2/9*3/1)]-2/5 =[6/90+(2/9*3/1)]-2/5 =[6/90+6/9]-2/5 =[6/90+60/90]-2/5 =[66/90]-2/5 =66/90-36/90 =30/90 =1/3

Hvordan forenkler du frac {(- 8) ^ {4} cdot 16 ^ {3} cdot 35 ^ {3}} {14 ^ {3} cdot 50 ^ {2} cdot 24 ^ {- 2}}?

18/5 = 3,6 ((-8) ^ 4 * 16 ^ -3 * 35 ^ 3) / (14 ^ 3 * 50 ^ 2 * 24 ^ -2 = (- 8) ^ 4 * 16 ^ -3 * 35 ^ 3 * 14 ^ -3 * 50 ^ -2 * 24 ^ 2 = ((- 2) ^ 3) ^ 4 * (2 ^ 4) ^ - 3 * 5 ^ 3 * 7 ^ 3 * 2 ^ -3 * 7 ^ -3 * 2 ^ -2 * (5 ^ 2) ^ - 2 * 3 ^ 2 * (2 ^ 3) ^ 2 = (-2) ^ 12 * 2 ^ -12 * 2 ^ (- 3-2 +6) * 3 ^ 2 * 5 ^ (3-4) * 7 ^ (3-3) = 2 ^ 12 * 2 ^ -12 * 2 ^ 1 * 3 ^ 2 * 5 ^ -1 * 7 ^ 0 = (2 * 9 * 1) / 5 = 18/5 = 3,6 Bemærk: 1. "" (-2) ^ 12 = 2 ^ 12 da eksponenten er lige 2. "" 7 ^ 0 = 1 .... pr. Definition