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1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)
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1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)
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1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20
=1÷3/2÷4/3÷5/4÷.÷21/20
=1×2/3×3/4×4/5×.20/21
=2×20/21
=40/21
=1÷3/2÷4/3÷5/4÷.÷21/20
=1×2/3×3/4×4/5×.20/21
=2×20/21
=40/21
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