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Scrieti ca produs de doua numere naturale: a) 4 orI 3 plus 4ori 2; b) 3ori17plus 12ori17minus 9ori17; c)31ori 4plus31; d) 19 ori 7 plus19ori3minus19plus19ori8

Răspuns :

4*3+4*2= 4*(3+2)=4*5=20

3*17+12*17- 9*17= 17*(3+12-9)=17*6=102

31*4+31=31*(4+1)=31*5=155

19*7=135