找规律,()里填几?6,8,9,39; 8,7,9,48; ( ),8,9,81

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找规律,()里填几?6,8,9,39;8,7,9,48;(),8,9,81找规律,()里填几?6,8,9,39;8,7,9,48;(),8,9,81找规律,()里填几?6,8,9,39;8,7,9,4

找规律,()里填几?6,8,9,39; 8,7,9,48; ( ),8,9,81
找规律,()里填几?6,8,9,39; 8,7,9,48; ( ),8,9,81

找规律,()里填几?6,8,9,39; 8,7,9,48; ( ),8,9,81
11
6*8-9+0=39
8*7-9+1=48
11*8-9+2=81