Question

x的平方加4x加4分之x的平方减4y的平方×3x的平方加6xy分之x加2？

Answer 1

(x²-4y²)/(x²+4x+4)
×
(x+2)/(3x²+6xy)
=[(x+2y)(x-2y)/(x+2)²]
×
(x+2)/[3x(x+2y)]
因式分解
=[(x+2y)(x-2y)(x+2)]/[3x(x+2y)(x+2)²]
分子乘以分子，分母乘以分母
=(x-2y)/3x(x+2)
约去分子分母中相同的项
=(x-2y)/(3x²+6x)
化简