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7/180+7/84+11/210. gasiti numitorul comun

Răspuns :

NC este
180=2^2×5×3^2
84=2^2×3×7
210=2×5×3×7
NC=2^2×3^2×5×7
NC=4×9×5×7
NC=1260
7×(7/180)+15×(7/84)+6×(11/210)=
=49/1260+1065/1260+66/1260=
=1180/1260÷(2)=590/630÷(2)=295/315÷(5)=59/63

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