325×(1/1×2×3×4+1/2×3×4×5+2/4×5×6×7+2/5×6×7×8+…+8/22×23×24×25+8/23×24×25×26)
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325×(1/1×2×3×4+1/2×3×4×5+2/4×5×6×7+2/5×6×7×8+…+8/22×23×24×25+8/23×24×25×26)
咨询记录 · 回答于2023-01-03
325×(1/1×2×3×4+1/2×3×4×5+2/4×5×6×7+2/5×6×7×8+…+8/22×23×24×25+8/23×24×25×26)
325×(1/1×2×3×4+1/2×3×4×5+2/4×5×6×7+2/5×6×7×8+…+8/22×23×24×25+8/23×24×25×26)
325x(1x4~26十丨x6~26+…十8x1~22)/1x2x3~26
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325x(1x…x27)/(1x…x26)