(2a+3b-1)(1-2a-3b),怎么简便计算
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![(2a+3b-1)(1-2a-3b),怎么简便计算](/uploads/image/z/3008864-56-4.jpg?t=%282a%2B3b-1%29%281-2a-3b%29%2C%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
(2a+3b-1)(1-2a-3b),怎么简便计算
(2a+3b-1)(1-2a-3b),怎么简便计算
(2a+3b-1)(1-2a-3b),怎么简便计算
(2a+3b-1)(1-2a-3b)
=-(2a+3b-1)(2a+3b-1)
=-[(2a+3b)-1]^2
=-(2a+3b)^2+2(2a+3b)-1
=-4a^2-12ab-9b^2+4a+6b-1
(2a+3b-1)(1-2a-3b)
=-(2a+3b-1)(2a+3b-1)
=-(2a+3b)^2+4a+6b-1
=-4a^2-12ab-9b^2+4a+6b-1
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