11(a-b)+1/11(b-a)^3

11(a-b)+1/11(b-a)^3

11(a-b)+1/11(b-a)^3
=11(a-b)-1/11(a-b)^3
=-1/11(a-b)[(a-b)^2-1/121]
=-1/11(a-b)(a-b+1/11)(a-b-1/11)

6500×(1+3×3.33%)=7143.5
答：到期后何老师应取出7143.5元
450÷0.9÷(1-20%)=625
答：这套衣服原价是625元
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