①16m^-n^4②16(a-b)²;-9(a+b)²;③x^5y-xy④2012²;-2011²;⑤429²;×2-171²;×2⑥1000²;/252²;-248²;⑦(50又1/11)²;-(49又10/11)²;

①16m^-n^4②16(a-b)²;-9(a+b)²;③x^5y-xy④2012²;-2011²;⑤429²;×2-171²;×2⑥1000²;/252²;-248²;⑦(50又1/11)²;-(49又10/11)²;

①16m^4-n^4=(4m²;+n²;)(4m²;-n²;)=(4m²;+n²;)(2m+n)(2m-n)②16(a-b)²;-9(a+b)²;=[4(a-b)]²;-[3(a+b)]²;=[4(a+b)+3(a-b)][4(a+b)-3(a-b)]=(7a+b)(-a+7b)=-(7a+b)(a-7b)…