Question

Oblicz:

a) (3 3/5 + 2 4/5):6/7=

b) 3/4:4 1/2+7:1 1/6=

c) 3/5:(1 1/2-3/4)=

(1 1/2-1 1/3)x2 2/5-1/10=

(6 1/4-2 1/2):2 1/7=

Answer 1

a) (3 3/5 + 2 4/5):6/7=(18/5 + 14/5) * 7/6 = 32/5 * 7/6 = 224/30 =7,4(6)

b)  3/4:4 1/2+7:1 1/6 = 3/4 : 9/2 + 7 : 8/6 = 3/4 * 2/9 + 7 * 6/8 = 6/36 + 42/8 = 12/72 + 378/72 = 390/72 = w przybliżeniu 5,42

c) 3/5:(1 1/2-3/4)= 3/5 : (3/2 - 3/4) = 3/5 : (6/4 - 3/4) = 3/5 : 3/4 = 3/5 * 4/3 = 12/15

 

(1 1/2-1 1/3)x2 2/5-1/10= (3/2 - 5/3) * 12/5 - 1/10 = (9/6 - 10/6) * 24/10 - 1/10 = -1/6 * 23/10 = -10/60 * 138/60 = 128/60 = 2,1(3)

 

(6 1/4-2 1/2):2 1/7= (61/4 - 5/2) : 15/7 = (61/4 - 10/4) : 15/7 = 51/4 * 7/15 = 357/60= 5,95