34 Completează tabelul:
3
2
a
17
13
45
a 9
72
(a + 2) 9
![34 Completează Tabelul32a171345a 972a 2 9 class=](https://ro-static.z-dn.net/files/d29/f912ed836f3179857bc99d89cdecfe97.jpg)
Răspuns:
a) a=7
a+9=7+9=16
a×9=7×9=63
(a+2)×9=(7+2)×9=9×9=81
b) a=?
a+9=17==> a=17-9=8
a=8
a×9=8×9=72
(a+2)×9=(8+2)×9=10×9=90