x³(-y³)²+(-1/2xy²)³,其中x=-1/2,y=-根号2,
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![x³(-y³)²+(-1/2xy²)³,其中x=-1/2,y=-根号2,](/uploads/image/z/1971446-14-6.jpg?t=x%26%23179%3B%EF%BC%88-y%26%23179%3B%EF%BC%89%26%23178%3B%2B%EF%BC%88-1%2F2xy%26%23178%3B%EF%BC%89%26%23179%3B%2C%E5%85%B6%E4%B8%ADx%3D-1%2F2%2Cy%3D-%E6%A0%B9%E5%8F%B72%2C)
x³(-y³)²+(-1/2xy²)³,其中x=-1/2,y=-根号2,
x³(-y³)²+(-1/2xy²)³,其中x=-1/2,y=-根号2,
x³(-y³)²+(-1/2xy²)³,其中x=-1/2,y=-根号2,
x³(-y³)²+(-1/2xy²)³
=x³y的6次方-1/8x³y的6次方
=7/8x³y的6次方
当x=-1/2 ,y=-√2时
原式=7/8×(-1/8)×8
=-7/8
2
x³(-y³)²+(-1/2xy²)³
=(-1/2)³(-(-根号2)³)²+(-1/2*(-根号2)²)³
=-1/8*8+(-1)³
=-1-1
=-2