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(-5)-2×50=15；⑥（3.14-π）0=1A．1个B．2个C．3

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