60i-|x+yi|-|x+yi|是模,是个实数所以实部是-|x+yi|,虚部是60共轭复数实部相等,虚部相反数,x+y-30=-|x+yi|=-√(x²+y²)-xy=-60xy=60x+y-30=-√(x²+y²)平方x²+y²+900+2xy-60x-60y=x²...