(1×2×3+2×4×6+…+100×200×300)/(2×3×4+4×6×8+…+200×300×400)=:Y/c.@(a/Y;~8l*i/s2W5k3E7L3[8i1P1^)r(K1h/m.]:A:n+c3\9c2c/[7X
算式:提示(B8U:W-_/t3[8i1P1^)r(K1h/m.]:A:n+c3\9c2c/[7X