649÷67=?用简便方法

更新时间2019-12-10 06:29:56

1】649÷67=649/67

2】649÷67

=(670-21)÷67

=670÷67-21÷67

=10-21/67

=(9+46/67)

原式=10-18/67=9又49/67。

649÷67

=(670-21)÷67

=670÷67-21/67

=10-21/67

=9+46/87

=9......46

用计算机算最简便