若a+2b-3c=4，5a-6b+7c=8，则9a+2b-5c=______．
人气：269 ℃ 时间：2020-02-05 07:03:37
解答
∵a+2b-3c=4，
∴4a+8b-12c=16①，
又∵5a-6b+7c=8②，
∴①+②得：9a+2b-5c=24．
故答案为24．
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