若a与b互为相反数,c与d互为负倒数,m的绝对值是2
a+b=0 cd=-1 |m|=2
丨a+b丨-(m²-cd)+2(m²+cd)-m的5次方乘a-m的5次方乘b
=丨0丨-(4-(-1))+2(4-1)-m^5乘a-m^5*b
=-5+6-m^5(a+b)
=1-m^5*0
=1
若a与b互为相反数,c与d互为负倒数,m的绝对值是2
a+b=0 cd=-1 |m|=2
丨a+b丨-(m²-cd)+2(m²+cd)-m的5次方乘a-m的5次方乘b
=丨0丨-(4-(-1))+2(4-1)-m^5乘a-m^5*b
=-5+6-m^5(a+b)
=1-m^5*0
=1