De la I am facut pe 4:
2/3=4/6=16/24=20/15
De la II:
1. 23/2x+1=23/2•4+1 raspuns :B
2. 7/23+5/23-x/23=2/23- ->12/23-x/23=2/23 - ->x/23=12/23-2/23- ->x/23=10/23- ->x=10 raspuns:C
3. x=a/100 +b/1000 amplificam a/100 cu 10 si obtinem x=10a +b/1000
Y=b/100+c/1000amplificam b/100 cu 10 si obtinem 10b+c/1000
Z=c/100+a/1000 amplificam c/100 cu 10 si obtinem 10c+a/1000
A=x+y+z
A=10a+b+10b+c+10c+a/1000
A=11a+11b+11c/1000
A=11(a+b+c)/1000
A=11•13/1000
A=143/1000
A=0,143
n•A€N- ->n•0,143€N - ->1000•1,43€N raspuns:D
4. nr prime cuprinse intre 10 si 20:11,13,17,19
11/13,11/17,11/19,13/11,13/17,13/19,17/11,17/13,17/19,19/11,19/13,19/17
Sunt 12 fractii asa.raspuns:C
De la III:
a).1/3 •120=40 raspuns:3
b)3/8•(5/9•72)=3/8•40=15 raspuns:2
Sper ca ti.am fost de ajutor!
