Question

Tính nhanh

\(\frac{1991\times1993-1}{1990+1991\times1992}\)

 

Answer 1

\(\frac{1991x1993-1}{1990+1991x1992}=\frac{1991x\left(1992+1\right)-1}{1990+1991x1992}=\frac{1991x1992+1991-1}{1990+1991x1992}=\frac{1991x1992+1990}{1990+1991x1992}=1\)

Answer 2

\(\frac{1991.1993-1}{1990+1991.1992}=1\)

k nha

Answer 3

Kết quả là: \(\frac{1}{1990}\)

Answer 4

Bằng 1

Answer 5

\(\frac{1991\times1993-1}{1990+1991\times1992}=\)

\(\frac{1991\times\left(1992+1\right)-1}{1991\times1992+1990}=\)

\(\frac{1991\times1992+1\times1991-1}{1991\times1992+1990}=\)

\(\frac{1991\times1992+1991-1}{1991\times1992+1990}=\)

\(\frac{1991\times1992+1990}{1991\times1992+1990}=1\)

Answer 6

\(\frac{1991\times1993-1}{1990+1991\times1992}\)

\(=\frac{1991\times\left(1992+1\right)-1}{1990-1991\times1992}\)

\(=\frac{1991\times1992+1991-1}{1990+1991\times1992}\)

\(=\frac{1991\times1992+1990}{1990+1991\times1992}=1\)