21xy-14xz+35x² 15xy+10x²-5x 12a(x²+y²)-18(x²+y²)(2a+b)(3a-2b)-4a(2a+b)这些题怎么写21xy-14xz+35x² 15xy+10x²-5x 12a(x²+y²)-18(x²+y²)
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