Question

  1,Tính nhanh  

\(\frac{1995.1993-18}{1993.1994+1975}\)

                       các bạn giúp mình nha mình cần gấp

Answer 1

\(\frac{1995.1993-18}{1993.1994+1975}=\frac{\left(1994+1\right).1993-18}{1993.1994+1975}\)

                                          \(=\frac{1994.1993+1993-18}{1993.1994+1975}=\frac{1994.1993+1975}{1993.1994+1975}=1.\)

Answer 2

\(\frac{1995\cdot1993-18}{1993\cdot1994+1975}\)

\(=\frac{\left(1994+1\right)\cdot1993-18}{1993\cdot1994+1975}\)

\(=\frac{1994\cdot1993+\left(1993-18\right)}{1993\cdot1994+1975}\)

\(=\frac{1994\cdot1993+1975}{1993\cdot1994+1975}\)

\(=1\)