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The number of books in the bookshop ________ (be) about 10,000 and most of them are about science.
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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
My life, as it really is, is always filled with sadness and little joy.
1年前
已知2*3=2+3+4=9,5*4=5+6+7+8=26。若x*3=15,则x=
1年前