(a-b)(ab-bc-ac+c²) 求详解.求带文字解释.
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(a-b)(ab-bc-ac+c²) 求详解.求带文字解释.
(a-b)(ab-bc-ac+c²) 求详解.求带文字解释.
(a-b)(ab-bc-ac+c²) 求详解.求带文字解释.
(a-b)(ab-bc-ac+c²)
=(a-b){(ab-bc)-(ac-c²)}
=(a-b){b(a-c)-c(a-c)}
=(a-b)(b-c)(a-c)
直接展开:a2b-abc-a2c+ac2-ab2+b2c+abc-bc2
化简:a2b-a2c+ac2-ab2+b2c-bc2
(a-b)(ab-bc-ac+c²)
=(a-b)[b(a-c)-c(a-c)]
=(a-b)[(a-c)(b-c)]
=(a-b)(b-c)(a-c)
(a-b)(ab-bc-ac+c²)
=(a-b)[(ab-bc)-(ac-c²)]
=(a-b)[b(a-c)-c(a-c)]
=(a-b)[(b-c)(a-c)]
=(a-b)(b-c)(a-c)
就乘进去,化简吧。。。