If a means $$+$$, b means $$\times$$, c means $$\div$$, d means $$-$$, then $$20a10b45c5d12 = ?$$
According to the problem,
$$20a10b45c5d12$$ = $$20+10\times45\div5-12$$
$$=20+10\times9-12$$
$$=20+90-12$$
$$=110-12$$
$$=98$$
Hence, the correct answer is Option A
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