1.若a与3b互为倒数a*3b=1-9ab=-3*3ab=-32.ab互为相反数,cd互为倒数,且b不等于0a+b=0a=-bcd=1a/b+cd=-1+1=03.ab互为相反数,cd互为倒数,x的绝对值为1a+b=0cd=1|x|=1x^2=1x=±1(1-x)^2/cd+(a+b+cd)*x=1-2x+x^2+x=2-x=3...