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- 1某书店把一本书按标价的8折出售,仍可以获利百分之20,若该书的进价为20元,则标价为多少元
- 2have sb doing sth
- 3若函数y=f(x)(定义域为D,值域为A)且函数y=f(x)在定义域D上有单调性,则函数y=f(x)一定有反函数吗?
- 4椭圆x^2/4+y^2=1,一组平行直线的斜率是3/2 问:这组直线何时与椭圆相交?急用,
- 5she wants to borrow a book -------science.A.on B.of C.in D.for
- 6某工人用250N的水平推力将重800N的物体沿水平路面向前运动了20m,用了40s,重力对物体做的功是_____J,
- 7please open yeasterday the handout 和today you are
- 8一座长桥长3400米,一列火车通过大桥时每分钟行800米,共4.这列火车长多少米?
- 9You drive a car in hong kong.You must drive on the left side of the street.用if连接两个句子
- 10在口里填上一个数字,使每个数既是3的倍数又是奇数.8口,35口,42口,56口,