Răspuns:
Explicație pas cu pas:
a. 315 = 5*63
320 = 5*64
315/320 = 5*63/5*64 = 63/64
b. 48 = 4*12
124 = 4*31
48/124=4*12 / 4*31 = 12/31
c. 360 = 36*10 = 6*6*10
420 = 7*60 = 7*6*10
360/420 = (6*6*10)/(7*6*10) = 6/7
d. 312 = 3*104 = 3*2*52=3*2*4*13
390 = 39 * 10 = 3*13*10
312/390 = (3*2*4*13)/(3*13*10) = 8/10 = 4/5