计算:(3x+1)(x+2)

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计算:(3x+1)(x+2)
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计算:(3x+1)(x+2)
计算:(3x+1)(x+2)

计算:(3x+1)(x+2)
(3x+1)(x+2)
=3x²+x+6x+2
=3x²+7x+2

:(3x+1)(x+2)
=3x^2+7x+2

﹙3x+1﹚﹙x+2﹚
=3x﹙x+2﹚+1×﹙x+2﹚
=3x²+6x+x+2
=3x²+7x+2.