有一块三角形菜地，底是12.5米，高是6米，如果每平方米可种大白菜18棵，一共可以种多少棵？
直接写出得数．×=××=÷3= 12×=+﹣+= 20÷= 18÷÷=×= 0×=×÷×=
口算 56×= 2﹣=+= 6×= 0.25×4= 57×=÷= 1÷= 21÷=÷= 1÷= 0÷=
计算下面各题．×21×÷5×÷÷÷÷24×÷8．
计算．×9=×0= 0÷=÷= 12×=×=÷=÷=
直接写得数×=÷5=×12=×=÷=÷=×= 1÷== 45×=÷2=÷=×=÷=×0=×= 1﹣=÷=×= 15÷=
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