已知a的2次方+2ab=—8,b的2次方+2ab=14,则a的2次方+4ab+b的2次方=?;a的2次方—b的2次方=?
人气:469 ℃ 时间:2020-05-13 11:22:27
解答
第一问:14-8=6
二:-8-14=-22
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