小學(xué)四年級口算題：整十?dāng)?shù)除整十?dāng)?shù)

小學(xué)四年級口算題：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 =