1.2-(x-5)²的最大值是_________,此时x是__________.2.若a²-a-3=0,求a³-4a²+2的值.3.已知有理数a,b,且a+b
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1.2-(x-5)²的最大值是_________,此时x是__________.2.若a²-a-3=0,求a³-4a²+2的值.3.已知有理数a,b,且a+b
1.2-(x-5)²的最大值是_________,此时x是__________.
2.若a²-a-3=0,求a³-4a²+2的值.
3.已知有理数a,b,且a+b
1.2-(x-5)²的最大值是_________,此时x是__________.2.若a²-a-3=0,求a³-4a²+2的值.3.已知有理数a,b,且a+b
2-(x-5)²有最大值,则(x-5)²有最小值,即(x-5)²=0,x-5=0,x=5,则最大值为2.
a²-a-3=0,则a²-a=3,a³-4a²+2=-1.
x=5,最大值是1.2
2-(x-5)²的最大值是2,此时x是(5)
若a²-a-3=0,求a³-4a²+2的值是(-1)。
1:2,5
2:a³-4a²+2=a*a²-4a²+2=a*(a+3)-4a²+2=3(a-a²)+2=-7
3:a<-1-b,a<1+b,所以a<0,b<-1-a,b