在边长为1的正方形内任取51个点，求证：一定可以从中找出3点，以它们为顶点的三角形的面积不大于1/50．
直接写得数= = = = == = = = =
直接写得数= = = 3÷8= = == = = = = =
直接写出得数．93= 8.7﹣7= ÷1= 21÷7=7×÷7×= 44÷= 75÷10%= 0.9+99×0.9=
直接写出得数 ．
直接写出得数．÷= += ÷= ×=1÷0.25= ÷1= ÷3= ﹣=
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= 3÷8= 
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÷1
= 21
÷7=
÷7×
= 75÷10%= 0.9+99×0.9=
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×
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÷1= 
÷3= 
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