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4 urgent !!!! dau coroana

4 Urgent Dau Coroana class=

Răspuns :

a) ab+ac=a x(b+c)=2x50=100
b) xy + xz + 15= X x(y+z)+15=9x11+15=99+15=114
c) ab-ac=a x(b-c)=7x100=700
d)5xy + 5xz + 21=5X x(y-z)+21=5x2011+21=1055+21=1076