已知丨x+1丨+丨y+2丨=0,求x³+½xy²的值
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![已知丨x+1丨+丨y+2丨=0,求x³+½xy²的值](/uploads/image/z/12578059-19-9.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%A8x%2B1%E4%B8%A8%2B%E4%B8%A8y%2B2%E4%B8%A8%3D0%2C%E6%B1%82x%26%23179%3B%2B%26%23189%3Bxy%26%23178%3B%E7%9A%84%E5%80%BC)
已知丨x+1丨+丨y+2丨=0,求x³+½xy²的值
已知丨x+1丨+丨y+2丨=0,求x³+½xy²的值
已知丨x+1丨+丨y+2丨=0,求x³+½xy²的值
∵|x+1|+|y+2|=0
∴x+1=0,y+2=0
∴x=-1,y=-2
∴x³+1/2xy²
=(-1)³+1/2×(-1)×(-2)²
=-1+1/2×(-1)×4
=-1-2
=-3
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