问题 填空题
计算:
1
2
xy2÷(-4x2y)=______.
答案

1
2
xy2÷(-4x2y),

=-(

1
2
÷4)(x÷x2)(y2÷y),

=-

1
8
x-1y,

=-

y
8x

故填-

y
8x

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