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∵在△ABC中,a=7,b=8,cosC=1314,∴c2=a2+b2-2abcosC=49+64-2×7×8×1314=9,得c=3∵b>a>c,∴最大邊為b,可得B為最大角囙此,cosB=49+9−642×7×3=−17,即最大角的余弦值為−17故選:C
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