几个数相乘积是1，那么这几个数互为倒数． ．
×36=117 65× =91．
在括号里填上合适的数． × =80 ÷ =11．
根据乘法算式写出除法算式．
△×6=1.8△= ．
16÷ =× = 49÷ =÷ =× = 2.4× =3．
× =
÷ =
× =
2.4× =3．
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