下列运算中，正确的个数有：①m3+（﹣m3）=m6；②m2·m3=m6；③（﹣2xy）4=8x4y4；④x3n÷xn=x3；⑤；⑥（3.14﹣π）0=1[]A．1个B．2个C．3个D．4个-七年级数学

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