③ (a-b)(a-c)(b-c) 其中a=1/2 b=1/3 c=1/6 ④ ab-bc+3ab+2bc ⑤ m-1/4m+1/3-1/2m+1/6m-1/5

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③ (a-b)(a-c)(b-c) 其中a=1/2 b=1/3 c=1/6 ④ ab-bc+3ab+2bc ⑤ m-1/4m+1/3-1/2m+1/6m-1/5

③ (a-b)(a-c)(b-c) 其中a=1/2 b=1/3 c=1/6 ④ ab-bc+3ab+2bc ⑤ m-1/4m+1/3-1/2m+1/6m-1/5
③ (a-b)(a-c)(b-c) 其中a=1/2 b=1/3 c=1/6 ④ ab-bc+3ab+2bc ⑤ m-1/4m+1/3-1/2m+1/6m-1/5

③ (a-b)(a-c)(b-c) 其中a=1/2 b=1/3 c=1/6 ④ ab-bc+3ab+2bc ⑤ m-1/4m+1/3-1/2m+1/6m-1/5
③(a-b)(a-c)(b-c)=(1/2-1/3)(0.5-1/6)(1/3-1/6)=1/108 ④ ab-bc+3ab+2bc=4ab+bc==4x0.5x1/3+(1/3)x1/6=19/54 ⑤m-1/4m+1/3-1/2m+1/6m-1/5=0.5m-1/12m+2/15