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写出差是9的减法算式,你能写出多少道?
( )-( )=9 ( )-( )=9 ( )-( )=9 ( )-( )=9
若y=(a-1)x3a2-1是关于x的二次函数,则a=____。
一 does it take you to go to work from here by walk?
一 About walk.