(9x^4y^5+45x^2y^4)÷(-3xy^2)^2

问题描述:

(9x^4y^5+45x^2y^4)÷(-3xy^2)^2

=-4x2-4y2-14xy
=-4(x2+y2)-14xy
=-4×5-14×(-1)
=-20+14
=-6