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1、同時都含有字母a,b,c,d 2、且係數為1 3、8次單項式 同時滿足上述3個條件的單項式有以下幾種情況: (1)指數都是2;有1個 (2)指數是兩個1,兩個3;有4個 (3)指數是三個1,一個5;有4個, (4)指數是一個1,兩個2,一個3;有10個, (5)指數是一個4,兩個1,一個2;有10個, 所以這樣的單項式共有:10+10+4+4+1=29個
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