已知x-2y=-2b=-4098,求2bx²-8bxy+8by²-8b的值(guocheng
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发布时间:2024-09-26 23:08
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热心网友
时间:2024-10-05 03:36
2bx2-8bxy+8by2-8b
=2b(x^2-4xy+4y)-8b
=2b(x-2y)^2-8b
=2b*4b^2-8b
=8b^2-8b
=8b(b-1)
=4*4098*(2049-1)
=4*4098*2048
热心网友
时间:2024-10-05 03:40
2bx2-8bxy+8by2-8b
=2b(x^2-4xy+4y)-8b
=2b(x-2y)^2-8b
=2b*4b^2-8b
=8b^2-8b
=8b(b-1)
=4*4098*(2049-1)
=4*4098*2048