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calculeaza in doua moduri: a) 12x7+12x3= b)6x10+12x10+17x10= c)14x22-14x10-14=

Răspuns :

a)84+36=120 
sau 
12(7+3)=12x10=120

b)60+120+170=350
sau
10(6+12+17)=10x35=350

c)308-140-14=154
sau
14(22-10-1)=14x11=154