小學(xué)四年級(jí)數(shù)學(xué)口算題：整十?dāng)?shù)除整十?dāng)?shù)
(1)80÷20=
(2)80÷20=
(3)80÷40=
(4)80÷40=
(5)60÷30=
(6)60÷30=
(7)80÷40=
(8)60÷30=
(9)40÷20=
(10)60÷30=
(11)20÷10=
(12)40÷20=
(13)80÷40=
(14)80÷40=
(15)60÷30=
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