Question

若4a-9与3a-5互为相反数，则a*a-2a+1的值为（ )

Answer 1

因为4a-9与3a-5互为相反数,即 (4a-9)+(3a-5)=0 ==> a=2则a*a-2a+1=2*2-2*2+1=1

Answer 2

4a -9 + 3a -5 =0
a =2
a的平方-2a +1 = 4 -4 +1 =1

Answer 3

a=2，答案为1

Answer 4

负一