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1.解:(2)是因式分解,(1)(3)不是.
2.解:(1)4x²-12x³=4x²(1-3x).
(2)-x²y+4xy-5y=-y(x²-4x+5).
3.解:IR1+IR2+IR3
=I(R1+R2+R3)
=2.5×(25.4+39.2+35.4)
=2.5×100=250.
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