选出每组中不同类的一项。 ( )(1) A. bit B. cool C. nice ( )(2) A. she B. he C. my ( )(3) A. teacher B. aunt C. sister ( )(4) A. is B. are C. has ( )(5) A. very B. big C. cute
苹果a千克,比梨子的4倍多b千克,梨有( )千克.
12a﹣8a+3a=( ) A.23a B.a C.7a
a3和3a比较,a3( )3a.
A是B的25倍,下面算式中正确的是( ) A.A×25=B B.A+25=B C.A=B×25
比X多50的数的6倍是( )