已知x-5=m的平方 5-x=n的平方 且(x-5)a+(5-x)b+2c=3.则c=
人气：313 ℃ 时间：2020-02-05 16:20:46
解答
∵x-5=m²,5-x=n²
∴m²+n²=0
∴m²=n²=0
∵（x-5）a+（5-x）b+2c=3
即m²a+n²b+2c=3
∴2c=3
c=1.5
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