(xy-2)2-(xy-x2y2)÷1/4xy
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(xy-2)2-(xy-x2y2)÷1/4xy=(xy-2)2-(xy-x2y2)*4/xy=(xy-2)2-xy(1-xy)*4/xy=(xy-2)2-4+4xy=x2y2-4xy+4-4+4xy=x2y2因为x=3y=-1/3,所以x2y2=1/729
咨询记录 · 回答于2022-11-28
(xy-2)2-(xy-x2y2)÷1/4xy
其中x=3y=-1/3
你好,请问一下你的1/4xy是分子上还是分母上
分子上
(xy-2)2-(xy-x2y2)÷1/4xy=(xy-2)2-(xy-x2y2)*4/xy=(xy-2)2-xy(1-xy)*4/xy=(xy-2)2-4+4xy=x2y2-4xy+4-4+4xy=x2y2因为x=3y=-1/3,所以x2y2=1/729