已知|x-2|+|y+1/3|=0,求5xy^2-[2x^2y-（4xy^2-2x^2Y)]的值要算式_数学解答

已知|x-2|+|y+1/3|=0,求5xy^2-[2x^2y-（4xy^2-2x^2Y)]的值
要算式

人气：263 ℃　时间：2020-06-28 01:44:00

解答

|x-2|+|y+1/3|=0,
则x-2=0,y+1/3=0
则x=2,y=-1/3
5xy^2-[2x^2y-（4xy^2-2x^2Y)]
=5xy²-2x²y+4xy²-2x²y
=9xy²-4x²y
=9×2×(-1/3)²-4×2²×(-1/3)
=2+16/3
=22/3