(-3a+2b+3c)(-3a+二分之b)

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(-3a+2b+3c)(-3a+二分之b)(-3a+2b+3c)(-3a+二分之b)(-3a+2b+3c)(-3a+二分之b)原式=9a^2-3ab/2-6ab+b^2-9ac+3bc/2=9a^2+

(-3a+2b+3c)(-3a+二分之b)
(-3a+2b+3c)(-3a+二分之b)

(-3a+2b+3c)(-3a+二分之b)
原式=9a^2-3ab/2-6ab+b^2-9ac+3bc/2
=9a^2+b^2-15ab/2-9ac+3bc/2
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