已知ab互为相反数,且a.b不等于0 cd互为倒数x的绝对值2/x/+(a+b+cd)x-cd+b/a

已知ab互为相反数,且a.b不等于0 cd互为倒数x的绝对值2/x/+(a+b+cd)x-cd+b/a
已知ab互为相反数,且a.b不等于0 cd互为倒数x的绝对值2
/x/+(a+b+cd)x-cd+b/a

已知ab互为相反数,且a.b不等于0 cd互为倒数x的绝对值2/x/+(a+b+cd)x-cd+b/a
ab互为相反数,且a.b不等于0 cd互为倒数
则a+b=0,cd=1
x的绝对值2
x=±2
/x/+(a+b+cd)x-cd+b/a
=2+（0+1）x-1-1
=x
=±2