a、b互为相反数，则a + b = 0a - ab + b = (a + b) - ab = -abaa + ab +1 = a(a + b) +1 = a * 0 +1 = 1所以（a -ab+b)/(aa + ab +1) = -ab = aa因为a -b = 4/5，a + b = 0，所以a = 2/5, b = -2/5所以 aa = 4/25
已知a与b互为相反数，且A-B=4/5.求（a-ab+b)/(aa+ab+1)的值
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a、b互为相反数，则a + b = 0a - ab + b = (a + b) - ab = -abaa + ab +1 = a(a + b) +1 = a * 0 +1 = 1所以（a -ab+b)/(aa + ab +1) = -ab = aa因为a -b = 4/5，a + b = 0，所以a = 2/5, b = -2/5所以 aa = 4/25
