Răspunsuri

2014-03-06T17:58:01+02:00
2/1=20/x
x*2=20*1=20
x=20/2=10

x/0,2=0,2/0,01
x*0,01=0,2*0,2=0,04=4/100
x=4/100:0,1=4/100*1/0,1=4/10