Question

Tính Nhanh

     1993 x 1991 - 1

_________________

 1992 + 1990 x 1993

 

 

 

Answer 1

\(\frac{1993.1991-1}{1992+1990.1993}\)

\(=\frac{1993.1990+1993-1}{1993.1990+1992}=\frac{1993.1990+1992}{1993.1990+1992}=1\)

nha ><

Answer 2

Trả lời

1993.1991-1/1992+1990.1993

=1993.1990+1993-1/1993.1990+1992

=1993.1990+1992/1993.1990+1992

=1.

Answer 3

#)Giải :

\(\frac{1993\times1991-1}{1992+1990\times1993}\)

\(=\frac{1993\times\left(1990+1\right)-1}{1992+1990\times1993}\)

\(=\frac{1993\times1990+1993\times1-1}{1992+1990\times1993}\)

\(=\frac{1992}{1992}=1\)

Answer 4

\(\frac{1993\times1991-1}{1992+1990\times1993}\)

\(=\frac{1993\times\left(1990+1\right)-1}{1992+1990\times1993}\)

\(=\frac{1993\times1990+1993-1}{1992+1990\times1993}\)

\(=\frac{1993\times1990+1992}{1992+1990\times1993}\)

\(=1\)