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(a+b)-(ab+1) =a+b-ab-1 =(a-ab)+(b-1) =a(1-b)-(1-b) =(1-b)(a-1) ∵-2<a,b<1 ∴1-b>0,a-1<0 ∴(1-b)(a-1)<0 ∴a+b<ab+1 【很高興為你解决以上問題,希望對你的學習有所幫助!】≤、≥∠
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