画两条直线，让两条线平行；并画一条平行线间的垂线段．
直接写得数=====
直接写出得数． 17×=+=×52= 1÷= 3﹣=÷3= 0.32= 20×5.5=
直接写出得数+=﹣=÷= 0.37+1.6=
+=÷= 12.6﹣6.06= 201+75=×=
直接写出得数：﹣= 6×= 0÷=×=+=÷=×=×=
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×52= 1÷
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÷3= 0.32= 20×5.5=
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= 0.37+1.6=
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= 12.6﹣6.06= 201+75=
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= 6×
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