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数学
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6x+7y-6y-5xy+3xy-3x 其中x=3,y=2.(化简后求值)
人气:270 ℃ 时间:2020-05-14 00:34:03
解答
6x+7y-6y-5xy+3xy-3x
=(6-3)x+(3-5)xy+(7-6)y
=3x-2xy+y
把x=3,y=2代入:
原式
=3×3-2×3×2+2
=9-12+2
=-1
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