Question

     Care dintre afirmatiile urmatoare sunt adevarate si care sunt false ?                                                                                                                                             a=5,atunci ax7=35  axb=36,atunci a=0  axb=c,atunci axc=b  a:b=c,atunci a=bxc  a=b,atunci                                                                                                                                                 1_   din a reprezinta cat  1_  din b                          4                                   3                                                                                                                                                                                                                 4  

Answer 1

daca a=5 atunci a·7=35⇒5·7=35   adevarat
daca a=0 atunci a·b=36⇒0·b ≠36   fals
daca a·b=c atunci a·c=b       fals pt ca de ex.daca 4·3=12 atunci 4·12 nu este egal cu 4
daca a:b=c atunci a=b·c     adevarat pt.ca de ex. daca 8:4=2 atunci 8=4·2
daca a=b atunci 1/4·a=1/3·b    fals pt.ca a/4≠a/3 deci nu sunt egale