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数学
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-3(2x^2-xy)+4(x^2+xy-6)
人气:221 ℃ 时间:2020-03-23 04:57:16
解答
-3(2x^2-xy)+4(x^2+xy-6)
= - 6x ^2 +3xy +4x^2 + 4xy -24
= - 2x ^2 +7xy -24thank you~
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