在如图里描出各点并依次连成封闭图形，A（2，3）B（7.3）C（5，7）D（2，7）．所描述出的图形是 形．
直接写得数+= 3+1.75=÷=×=×=﹣=+=×0+3= （+）×=×÷×=
口算下面各题．﹣=+=﹣= 2÷=×6=÷=×6=×=﹣=÷=÷=×=×=÷=÷= 6.4÷0.08= 4﹣2.92=÷=
直接写得数： 1﹣=×=÷2÷= 2×80%=+= 15÷= 35×=×÷×=
直接写出得数．﹣=×= 12×= 1÷=== 1.6×4×0.25= 0÷=
直接写得数．+=÷6=×= 2﹣+=×16= 6﹣=÷=5×÷5×=
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= 3
+1.75=
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= 2÷
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×6=
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×6=
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×
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= 6.4÷0.08= 4﹣2.92=
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=
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×
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= 15÷
= 35×
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×
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= 1.6×4×0.25= 0÷
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÷6=
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×16= 6﹣
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=5×
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