约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
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约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
①-15(a+b)²/-25(a+b)
=3(a+b)/5
②x²y+xy²/2xy
=xy(x+y)/2xy
=(x+y)/x
③m²-3m/9-m²
=m(m-3)/(3-m)(3+m)
=-m/(m+3)
3(a+b)/5
X+Y/2
-M/M+3