若2a²-a-3=0,则5+2a²=
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若2a²-a-3=0,则5+2a²=
![若2a²-a-3=0,则5+2a²=](/uploads/image/z/19830798-54-8.jpg?t=%E8%8B%A52a%26%23178%3B-a-3%3D0%2C%E5%88%995%2B2a%26%23178%3B%3D)
2a²-a-3=0
(a+1)(2a-3)=0
a1=-1,a2=1.5
当a=-1时,5+2a²=5+2×1=7
当a=1.5时,5+2a²=5+2×2.25=9.5
(a+1)(2a-3)=0
a1=-1,a2=1.5
当a=-1时,5+2a²=5+2×1=7
当a=1.5时,5+2a²=5+2×2.25=9.5
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