未知题型
=9×______13÷57=13×______1÷78=______×______67÷9=______×______．9÷ 2 3 =9×______ 1 3 ÷ 5 7 = 1 3 ×______ 1÷ 7 8 =______×______ 6 7 ÷9=______×______．
【参考答案】
9÷ 2 3 =9× 3 2 ， 1 3 ÷ 5 7 = 1 3 × 7 5 ， 1÷ 7 8 =1× 8 7 6 7 ......
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