(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=则a一b=(a一b)(a^2+ab十b^2)/(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=3一a^2b十ab^2=(a一b)^2且a≠b,则a一(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=b=(a一b)(a^2+ab十b^2)/3一a^(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=(a一b)(a^2+ab十b^2)/3一a^2b十ab^2=(a一b)^2且a≠b,则a一b=