a+b=6,ab=27\4,a大于b,a方×b-b等于多少
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a+b=6,ab=27\4,a大于b,a方×b-b等于多少
a+b=6,ab=27\4,a大于b,a方×b-b等于多少
a+b=6,ab=27\4,a大于b,a方×b-b等于多少
a+b=6,ab=27/4,a>b,a²×b-b等于多少
a,b是方程x²-6x+27/4=0,即4x²-24x+27=(2x-3)(2x-9)=0的二根,故a=9/2,b=3/2.
∴a²b-b=(a²-1)b=(81/4-1)×(3/2)=(77/4)×(3/2)=231/8
a+b=6,ab=27\4 ﹙9/2,3/2﹚ ﹙3/2,9/2﹚ ,a方×b-b=﹙9/2﹚²x3/2-3/2=231/8﹙3/2,9/2﹚ a方×b-b=﹙3/2﹚² x9/2-9/2=45/8
由前面两个条件得到a=9/2,b=3/2,所以a方*b-b=231/8