(3a-5b-2c)(-3a-5b+8c)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 10:50:17
![(3a-5b-2c)(-3a-5b+8c)](/uploads/image/z/5932219-67-9.jpg?t=%EF%BC%883a-5b-2c%29%28-3a-5b%2B8c%29)
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(3a-5b-2c)(-3a-5b+8c)
(3a-5b-2c)(-3a-5b+8c)
(3a-5b-2c)(-3a-5b+8c)
(3a-5b-2c)(-3a-5b+8c)
=-9a^2-15ab+24ac+15ab+25b^2-40bc+6ac+10bc-16c^2
=-9a^2+25b^2-16c^2+30ac-30bc.
(3a-5b-2c)(-3a-5b+8c)
=[(3c-5b)+(3a-5c)][(3c-5b)-(3a-5c)]
=(3c-5b)^2-(3a-5c)^2