Bob was________to be studying at school,but to oursurprise,he was surfing the Internet. [ ]A. afford

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• 解方程：1x-1=2x-数学
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• 有五张正面分别标有数字-1，0，2，4，5的不透明卡片，它们除数字不同外其余全部相同．现将它们背面朝上，洗匀后从中任取一张，将该卡片上的数字记为a，那么使得关于x的分式方-数学
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