Gọi 2 số chưa biết là a,b
Ta có : a - b = 73,2
Thêm vào số bị trừ 6,9 đơn vị và số từ 5,4 đơn vị ta được :
(a + 6,9) - (b + 5,4 ) = a + 6.9 - b - 5,4 = a - b + 1,5 = 73,2 + 1,5 = 74,7
Vậy hiệu 2 số mới là 74,7.
nhgilk68776uu
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you đag talking j v
thêm dấu vào mới hiểu chứ
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