已知实数a、b、c满足a+b+c=0,a2+b2+c2=0.1,则a4+b4+c4的值是

日期:2016-09-08 23:07:21 人气:1

已知实数a、b、c满足a+b+c=0,a2+b2+c2=0.1,则a4+b4+c4的值是

∵a+b+c=0,∴(a+b+c)2=a2+b2+c2+2ab+2ac+2bc=0,∵a2+b2+c2=0.1,∴2ab+2ac+2bc=-0.1,∵(2ab+2ac+2bc)2=4(a2b2+a2c2+b2c2+2a2bc+2ab2c+2abc2)=0.01,∵2a2bc+2ab2c+2abc2=2abc(a+b+c)=0,∴a2b2+a2c2+b2c2=0.0025①(a2+b2+c2)2=a4+b4+c4+2(a2b2+a2c2+b2c2)=0.01②由①②得出,a4+b4+c4=0.005.故答案
    A+
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