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3×5-[39×5-(2×49+6×16):2]:7

Răspuns :

15-[195-(98+96):2]:7=
15-[195-194:2]:7=
15-[195-97]:7=
15-98:7=
15-14=1

3×5-[39×5-(2×49+6×16):2]:7⇔15-[195-(98+96):2]:7⇔15-(195-194:2):7⇔15-(195-97):7⇔15-98:7⇔15-14=1
Răspuns final: 1