下列各式计算正确的是（）①26÷22=4；②（23）2=26；③20=0；④25+25=26；⑤32x2yz÷8xy=4xz；⑥（2x+1）（x-1）=2x2-1；⑦（x-1）2=x2-1．A．①②⑤

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