Question

găsiți toate nr de doua cifre care sunt egale cu dublul unui nr de o singura cifra?

Answer 1

10=5×2
12=6×2
14=7×2
16=8×2
18=9×2

Answer 2

varianta 1
n=1,1×2=2(fals)
varianta 2
n=2,2×2=4(fals)
varianta 3
n=3,3×2=6(fals)
varianta 4
n=4,4×2=8(fals)
varianta 5
n=5,5×2=10(adevărat)
varianta 6
n=6,6×2=12(adevărat)
varianta 7
n=7,7×2=14(adevărat)
varianta 8
n=8,8×2=16(adevărat)
varianta 9
n=9,9×2=18(adevarat)