Question

[Phạm Gia Nghĩa]

Tính nhanh:

 

12 31

+

128 69

-

12 31

-

59 69

=

Answer 1

[Ngọc Mai_NBK]

=(128-59)/69= 1

Answer 2

[Emma]

\(\frac{12}{31}+\frac{128}{69}-\frac{12}{31}-\frac{59}{69}\)

\(=\left(\frac{12}{31}-\frac{12}{31}\right)+\left(\frac{128}{69}-\frac{59}{69}\right)\)

\(=\frac{69}{69}\)

\(=1\)