752-299-345
估算:差大约是____
笔算: 验算:
下列句子中划线成语使用有误的一项是( )
函数满足f(x)f(x+2)=13,若f(3)=2,则f(2013)=( )
Julie is the only c____ in her family, with no brothers or sisters.
462+283=____