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11个月前
The weather turned out to be fine yesterday.You __the trouble to carry your raincoat with you.
1年前
已知二次函数y=﹣x2+2x+3. (1)求函数图象的顶点坐标和图象与x轴交点坐标; (2)当x取何值时,函数值最大? (3)当y>0时,请你写出x的取值范围.
1年前
-What's the __________ of the ticket? -It's about five hundred yuan.
1年前
蝴蝶的翅每秒钟振动5-6次,蜜蜂的翅每秒振动300-400次.则( )
1年前