Question

5分之3×7分之1×13分之6＋7分之5×5分之1×13分之3＋13分之1×7分之3×5分之2

是简便算法！！

Answer 1

解：(3/5)*(1/7)*(6/13)+(5/7)*(1/5)*(3/13)+(1/13)*(3/7)*(2/5)
= (1/5 × 1/7 × 1/13) * (3×1×6 + 5×1×3 + 1×3×2)
= 1/455 * (18+15+6)
= 1/455 * 39
= 3/35

Answer 2

5分之3×7分之1×13分之6＋7分之5×5分之1×13分之3＋13分之1×7分之3×5分之2
=(5×7×13)分之(3×1×6＋5×1×3＋1×3×2)
=455分之39
=35分之3