Question

tìm a,b biết : a+b= 100, a-b= 100

Answer 1

a = ( 100 + 100 ) : 2 = 100

b = 100 - 100 = 0

vay a = 100

      b = 0

Answer 2

a = (100+ 100): 2 = 100

b= 100- 100 = 0

Answer 3

a=100

b=o