计算阴影部分的面积．
直接写得数．+=÷6=×= 2﹣+=×16= 6﹣=÷=5×÷5×=
直接写得数．===== 75%÷25%===
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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﹣=×=÷=÷=+=×=+=÷=﹣=×=
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÷6=
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= 2﹣
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×16= 6﹣
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=5×
÷5×
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= 75%÷25%=
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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=
﹣
= 1﹣137.5%=
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÷9= 1﹣
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