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补充图片 补充图片补充图片(xy-x²)*xy/(x-y)=x(x-y)*xy/(x-y)=x²y2x²y/3mn²*5m²n/4xy
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(xy-x²)*xy/(x-y)=x(x-y)*xy/(x-y)=x²y
2x²y/3mn²*5m²n/4xy²÷5xym/3n
=5mx/6ny*3n/5xym
=1/2y²
25.
(16-m²)/(16+8m+m²)÷(m-4)/(2m+8)*(m-2)/(m+2)
=-(m-4)(m+4)/(m+4)²*2(m+4)/(m-4)*(m-2)/(m+2)
=-2(m-2)/(m+2)
=(4-2m)/(m+2)
26.
(-2a²b/3c)³
=-8a^6b³/(27c³)
27.
(b/2a)²÷(-b/a)*(-3b/4a)³
=b²/4a²*(-a/b)*(-27b³/64a³)
=-b/4a*(-27b³/64a³)
=27b⁴/256a⁴