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cate nr ab au proprietatea a+ b=9.? CATE NR ab VERIFICA EGALITATEA a+3×9=15?

Răspuns :

a+b=9

a=0,1,2,3,4,5,6,7,8,9
b=9,8,7,6,5,4,3,2,1,0

0+9=9
1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9
9+0=9


a+3×9=15
a+27=15
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Sigur ai scris ceva gresit.