Question

Calculati (a+b)-c daca a=2 supra15 si b-c = 3 supra 20 si calculati a-b-c daca a =1intregsi 3 supra 8 si b+c = 5 supra 12

Answer 1

a=2/15
b-c=3/20
(a+b)-c=a+(b-c)=2/15+3/20( aduci la același numitor 3×5×4=60)
=
(8+9)/60=17/60
a-b-c=a-(b+c)
a=1 întreg 3/8=(8×1+3)/8=11/8
b+c=5/12
.a-(b+c)=11/8-5/12=(33-10)/24=23/24
8=2^3
12=2^2×3
[8,12]=2^3×4=24