What _____ Chen Jie _______ (doing) now?

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What_____ChenJie_______(doing)now?What_____ChenJie_______(doing)now?What_____ChenJie_______(doing)no

What _____ Chen Jie _______ (doing) now?
What _____ Chen Jie _______ (doing) now?

What _____ Chen Jie _______ (doing) now?
is doing

playing the vioin

如图,现有正方形甲1张,正方形乙2张,长方形丙3张,请你将它们拼成一个大长方形(画出图示),并运用面积之间的关系,将多项式a2+3ab+2b2分解因式.
a2+3ab+2b2=(a+b)(a+2b).