摘要：9．下列结论错误的个数是 (1)若x+3 = 5,则x = 3+5 (2)若ma = mb,则a = b (3)若9x = 3,则x = 3 (4)若5x-6 = 6x-5,则x = 1 A．1个 B．2个 C．3 个 D．4 个

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