A:①②③
B:②③④
C:①②④
D:①③④
All schools in our province________new English textbooks to improve students'listening,speaking,reading and writing abilities three years ago.
已知函数fx=1x,则y=fx-1+1的单调递减区间为( )
去括号且合并含有相同字母的项:
①3x+2(x-2)=____
②8y-6(y-2)=____
把下列词语补充完整。
雷打____ ____苦辣 ____凛凛