高分求把下列每组式子通分和化简!通分:⑴4/x+3与1/x-3⑵1/2ab^2与2/-a^2bc⑶1/2x-4与2/x^2-4x+4化简:①-25ab^4c^3/5abc^2②m^2-2m/4-m^2③x^2+3x+2/x^2-x-6
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