已知a²-2a+4的值为5,求4a-2a²+5的值,即-2a²+4a+5
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已知a²-2a+4的值为5,求4a-2a²+5的值,即-2a²+4a+5
已知a²-2a+4的值为5,求4a-2a²+5的值,即-2a²+4a+5
已知a²-2a+4的值为5,求4a-2a²+5的值,即-2a²+4a+5
a²-2a+4=5
a²-2a=1
4a-2a²+5=-2*(a²-2a)+5=3
a²-2a+4=5
a²-2a=5-4=1
4a-2a²+5
=-2(a²-2a)+5
=-2+5
=3
-2a²+4a+5=-2(a²-2a+4)+13=-10+13=3