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A=2*a^2-a+9/4 B=2*a+1 A-B=2a^2-a+9/4-2a-1 =2a^2-3a+5/4 =2(a-3/4)^2+5/4-9/8 =2(a-3/4)^2+1/8 ∵(a-3/4)^2≥0 ∴A-B>0 故A大於B
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