∣∣2180002181021∣∣=218⋅218⋅1+0⋅0⋅0++0⋅2⋅0−0⋅218⋅0−0⋅0⋅1−−1⋅2⋅218=47524−436=47088=0
A−1⎝⎛2180002181021∣∣∣100010001⎠⎞∼1r⋅21812r↔3r
∼⎝⎛10001218012∣∣∣218100001010⎠⎞∼3r+2r⋅(−218)
∼⎝⎛10001001−216∣∣∣21810000101−218⎠⎞∼3r⋅216−1
∼⎝⎛100010011∣∣∣21810000216−101108109⎠⎞∼2r+3r⋅(−1)
∼⎝⎛100010001∣∣∣21810002161216−10108−1108109⎠⎞
A−1=⎝⎛21810002161216−10108−1108109⎠⎞
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