2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?
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2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?2×1/1+2×3/1+3×4/1+4×5/1+……
2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?
2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?
2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1怎么解?
2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1
=(1/1-2/1)+(2/1-3/1)+……+(49/1-50/1)
=1-50/1
=50/49
2×1/1+2×3/1+3×4/1+4×5/1+……49×50/1
=1-2/1+2/1-3/1+3/1-4/1+-------+49/1-50/1
=1-50/1
=50/49
2×1/1+2×3/1+3×4/1+4×5/1+......49×50/1
=(1/1-2/1)+(2/1-3/1)+......+(49/1-50/1)
=1-50/1
=50/49
50/49