1×2×3+2×3×4+3×4×5+…+28×29×30=()。A.188690 B.188790 C.188890 D.188990 1×2×3+2×3×4+3×4×5+…+28×29×30=()。A.188690B.188790C.188890D.188990 参考答案 查看答案