56=27×2+2⇔2=56−2×27
27=2×13+1⇔1=27−2×13
よって
1=27−2×13
=27−(56−27×2)×13
=27×27−56×13
∴l=27,m=13
56=27×2+2⇔2=56−2×27
27=2×13+1⇔1=27−2×13
よって
1=27−2×13
=27−(56−27×2)×13
=27×27−56×13
∴l=27,m=13
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