题目内容
已知A+B=C,且B=
(3x-6),C=
(x-4),求A.
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∵A+B=C,且B=
(3x-6),C=
(x-4),
∴A=C-B=
(x-4)-
(3x-6)=
x-2-
x+1=-1.
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∴A=C-B=
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