9.9的二次+1.98+0.01
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9.9的二次+1.98+0.01
9.9的二次+1.98+0.01
9.9的二次+1.98+0.01
9.9²+1.98+0.01
=9.9²+2×9.9×0.1+0.1²
=(9.9+0.1)²
=10²
=100
9.9的二次+1.98+0.01
9.9的二次+1.98+0.01
9.9的二次+1.98+0.01
9.9²+1.98+0.01
=9.9²+2×9.9×0.1+0.1²
=(9.9+0.1)²
=10²
=100