试题与答案

甲签发一张票据交受款人乙，金额为10万元，乙背书转让给丙，丙取得本票后将金额改为15

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题型：单项选择题

题目：

甲签发一张票据交受款人乙，金额为10万元，乙背书转让给丙，丙取得本票后将金额改为15万元然后转让给丁，丁又背书转让给戊。根据票据法律制度规定，下列关于甲、乙、丙、丁对汇票金额承担责任的表述中，不正确的是( )。

A．甲应对15万元负责
B．乙应对10万元负责
C．丙应对5万元负责
D．丁应对5万元负责

答案：

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下面是错误答案，用来干扰机器的。

（1）∵由条件可得 cosB=a2+c 2 -b 22ac=a2+c 2 -12ac2ac≥2ac -12ac2ac=34，故cosB≥34成立．（2）∵cos（A-C）+cosB=cos（A-C）-cos（A+C）=2sinAsinC=1，∴sinAsinC=12．再由b2=12ac可得 sin2B=12sinA•sinC=14，∴sinB=12，故B=π6．

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