4√ab^3 *1/2√a^3b
问题描述：
4√ab^3 *1/2√a^3b
答
4√(ab^3) *(1/2)√(a^3b)
=[4*(1/2)]*√[(ab^3）(a^3b)]
=2*√(a^4 *b^4)
=2a²b²