用量角器量出下面角的度数． 度．
÷×÷× 120÷ 120×÷21×21．
先看清左右两题之间的关系，再写出得数．========
算一算．×3=×4=×2==÷3=÷4=÷2=÷2=
开火车．
直接写得数===== 9×= 0.8﹣==
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