2/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/2
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2/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/22/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/22/1a-(3a-2/3
2/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/2
2/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/2
2/1a-(3a-2/3b^)+(-3/2a+1/3b),其中a=-1/4,b=-1/2
原式=-5/2a+1/3b-2/3b²
把a=-1/4,b=-1/2 代入
原式=7/24