伸缩门是运用了平行四边形的 特性．
公顷是公顷的多少？
口算我最棒！ 1.25×8%=========
直接写得数×6= 0÷= 1÷10%= 4﹣﹣=×5+×9=÷=÷6= 45×80%= 5÷5÷=×2÷×2=
计算﹣×÷÷+﹣÷90%﹣12.5% 48%× 25%÷．
直接写得数﹣= 8×=÷= 3.5=×=×6=
公顷是
公顷的多少？
=
=
=
=
=
=
=
=
×6= 0÷
= 1÷10%= 4﹣
﹣
=
×5+
×9=
÷
=
÷6= 45×80%=
=
×2÷
﹣
×
÷
÷
+
﹣
÷90%
﹣12.5% 48%×
．
﹣
= 8×
=
÷
= 3.5
=
×
=
×6=
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