Question

（a+b）的四次方怎么分解呢大神们帮帮忙

Answer 1

解 原式 = [（a+b）] =[ (a+b)+2ab] =(a+b)+4ab(a+b)+4ab =a^4+2ab+b^4+4a^3b+4ab^3+4ab =a^4+4a^3b+6ab+4ab^3