①(3x+2y-4)²②(a-2b+3c)(a+2b-3c)算这两道题,要过程
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![①(3x+2y-4)²②(a-2b+3c)(a+2b-3c)算这两道题,要过程](/uploads/image/z/1239775-7-5.jpg?t=%E2%91%A0%EF%BC%883x%2B2y-4%EF%BC%89%26%23178%3B%E2%91%A1%28a-2b%2B3c%29%28a%2B2b-3c%29%E7%AE%97%E8%BF%99%E4%B8%A4%E9%81%93%E9%A2%98%2C%E8%A6%81%E8%BF%87%E7%A8%8B)
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①(3x+2y-4)²②(a-2b+3c)(a+2b-3c)算这两道题,要过程
①(3x+2y-4)²②(a-2b+3c)(a+2b-3c)算这两道题,要过程
①(3x+2y-4)²②(a-2b+3c)(a+2b-3c)算这两道题,要过程
①(3x+2y-4)²
=9x^2+6xy-12x+6xy+4y^2-8y-12x-8y+16
=9x^2+12xy-24x+4y^2-16y+16
②(a-2b+3c)(a+2b-3c)
=a^2+2ab-3ac-2ab-4b^2+6bc-3ac+6bc-9c^2
=a^2-4b^2-9c^2-6ac+12bc