3(a-b+1)-4(1/2a-b+1/4),其中a+b=-1
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![3(a-b+1)-4(1/2a-b+1/4),其中a+b=-1](/uploads/image/z/7618587-51-7.jpg?t=3%28a-b%2B1%29-4%281%2F2a-b%2B1%2F4%29%2C%E5%85%B6%E4%B8%ADa%2Bb%3D-1)
3(a-b+1)-4(1/2a-b+1/4),其中a+b=-1
3(a-b+1)-4(1/2a-b+1/4),其中a+b=-1
3(a-b+1)-4(1/2a-b+1/4),其中a+b=-1
3(a-b+1)-4(1/2a-b+1/4)
=3a-3b+3-2a+4b-1
=a+b+2
=-1+2
=1
3(a-b+1)-4(1/2a-b+1/4)
=3a-3b+3-(2a-4b+1)
=3a-3b+3-2a+4b-1
=a+b+2
=-1+2
=1