问123454321÷(12345×12345-12346×12344)=?
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问123454321÷(12345×12345-12346×12344)=?
问123454321÷(12345×12345-12346×12344)=?
问123454321÷(12345×12345-12346×12344)=?
123454321
123454321÷(12345×12345-12346×12344)=123454321÷{12345×12345-(12345+1)×(12345-1)}=123454321÷(12345×12345-12345×12345+1×1)=123454321 (用到平方差公式)