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72÷6-12÷a=12-4×1×1×3 afla necunoscuta

Răspuns :

12-12:a = 12-12
12-12:a = 0
12=12:a
a = 12:12
a = 1
12-12÷a=12-12
12-12÷a=0
12÷a=12+0
12÷a=12
a=12÷12
a=1
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