分别画出以下平等四边形和梯形的高，并分别标出它们的底．
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
计算． 1×4.8 2×3.5 2.3×1 2×0.63．
口算：×15=×2=×=×=×= 1×=×=×34=×=×=×=×=
直接写出得数．×40=﹣=×= 2×= 24×=×22= 18×=×=×=×=
计算下面各题×=×=×= 9××=+×××=
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