Question

2分之1+2×3分之2+2×3×4分之3+2×3×4×5分之4+2×3×4×5×6分之5+2×3×4×5×6×7分之6=

过程！

Answer 1

原式=2/4+18/4+96/5+600/6+4320/7
=5+101又1/3+713又1/7
=5+32600/42
=781又4/2
也许不对，望采纳。