小巧准备拿500元钱去为班级小朋友买17元每支的钢笔，小巧全班有33人，请你估一估小巧带的钱够吗？
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直接写得数．========
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直接写出结果．+=×10%= 3.6÷12= 80%×80%=×4÷×4= 15÷1%=﹣+﹣=
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×10%= 3.6÷12= 80%×80%=
×4÷
×4= 15÷1%=
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