Odpowiedzi

2009-10-16T21:38:29+02:00
A) 3,2 × ( 1 1/2 + 7,6 ) = 32/10 × (3/2 + 76/10) = 32/10 × ( 15/10 + 76/10 ) = 32/10 × 91/10 = 728 / 25 = 29 3/25

c) 6 3/5 ÷ 0,11 - 7,7 ÷ 1 1/10 = 33/5 ÷ 11/100 - 770/100 ÷ 11/10 = 33/5 × (-100/759) ÷ 11/10 = 20/23 × 10/11 = 200 / 253 = 1 53/253

d) (12,3 - 3 3/4) ÷ 0,5 = (492/40 - 150/40) × 2 = 342 × 2 = 684 = 684/1

e) 7-12/20 × 2,1 = 7 - 12/20 × 21/10 = 7 - 63/50 = 7 - 1 13/50 = 5 37/50

mam nadzieje że dobrze..
1 5 1