画一个平行四边形，使两组对边分别是5厘米和3厘米，并画出高．
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直接写出得数．+0.2=+﹣0.2= 5÷=×1.5+3= 3.6×=×1.5=﹣= 1﹣137.5%=
直接写得数﹣=÷9= 1﹣=×=÷=÷=+=×=+=÷=﹣=×=
直接写出得数．+=﹣=×2=×=×=÷4=÷= 12×=÷42=×=×14=÷4=
口算 78﹣0.8= 18×40= 910÷70= 1÷=﹣= 3﹣= 3.48+6.52=×=÷= 0.8﹣=
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+0.2=
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﹣0.2= 5÷
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×1.5+3=
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×1.5=
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= 1﹣137.5%=
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÷9= 1﹣
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×
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÷
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﹣
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×
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﹣
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×2=
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×
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÷4=
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= 12×
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÷42=
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×14=
÷4=
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﹣
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= 3.48+6.52=
×
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= 0.8﹣
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