定义a*b=a²-b ,求(a*2)*3的值?
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定义a*b=a²-b ,求(a*2)*3的值?
定义a*b=a²-b ,求(a*2)*3的值?
定义a*b=a²-b ,求(a*2)*3的值?
解
a*b=a²-b
(a*2)*3
先算
(a*2)
=a²-2
再算(a²-2)*3
=(a²-2)²-3
=(a^4-4a²+4)-3
=a^4-4a²+1
a*2=a²-2
(a²-2)*3=a²*3-2*3
=a4次方-3-(2²-3)
=a4次方-4