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[(y-2x)(-2x-y)-4(x-2y)²]÷3y,其中x=-3/16,y=-3/17
题目详情
[(y-2x)(-2x-y)-4(x-2y)²]÷3y,其中x=-3/16,y=-3/17
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答案和解析
[(y-2x)(-2x-y)-4(x-2y)²]÷3y,其中x=-3/16,y=-3/17
=(4x²-y²-4x²+16xy-16y²)÷3y
=(16xy-17y²)/3y
=16x/3-17y/3
=16/3×(-3/16)-17/3×(-3/17)
=-1+1
=0
=(4x²-y²-4x²+16xy-16y²)÷3y
=(16xy-17y²)/3y
=16x/3-17y/3
=16/3×(-3/16)-17/3×(-3/17)
=-1+1
=0
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