(1)若(x+4)²+(1/3y-2)²=0,则x+y=?(2)若|x|=3,y²=4,且xy>0,则2x+3y=?
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![(1)若(x+4)²+(1/3y-2)²=0,则x+y=?(2)若|x|=3,y²=4,且xy>0,则2x+3y=?](/uploads/image/z/3763691-35-1.jpg?t=%EF%BC%881%EF%BC%89%E8%8B%A5%EF%BC%88x%2B4%EF%BC%89%26%23178%3B%2B%EF%BC%881%2F3y-2%EF%BC%89%26%23178%3B%3D0%2C%E5%88%99x%2By%3D%3F%EF%BC%882%EF%BC%89%E8%8B%A5%7Cx%7C%3D3%2Cy%26%23178%3B%3D4%2C%E4%B8%94xy%EF%BC%9E0%2C%E5%88%992x%2B3y%3D%3F)
(1)若(x+4)²+(1/3y-2)²=0,则x+y=?(2)若|x|=3,y²=4,且xy>0,则2x+3y=?
(1)若(x+4)²+(1/3y-2)²=0,则x+y=?(2)若|x|=3,y²=4,且xy>0,则2x+3y=?
(1)若(x+4)²+(1/3y-2)²=0,则x+y=?(2)若|x|=3,y²=4,且xy>0,则2x+3y=?
(1)概念:一个数的平方一定大于等于0 若两数的平方和=0 则两数均为0
所以x=-4, y=1/6 x+y=-23/6
(2) 若x=3 y=2 2x+3y=12
若x=-3 y=-2 2x+3y=-12