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Ta có \(\frac{1995x1993-18}{1975+1993x1994}\)
=\(\frac{1993x1994+1993-18}{1975+1993x1994}\)
=\(\frac{1975+1993x1994}{1975+1993x1994}\)
=\(1\)
b)Ta có \(\frac{1996x1995-996}{1000+1996x1994}\)
=\(\frac{1996x1994+1996-996}{1000+1996x1994}\)
=\(\frac{1000+1996x1994}{1000+1996x1994}\)
=\(1\)
1994 x 867 + 1995 x 133
= 1994 x 867 + ( 1994 + 1 ) x 133
= 1994 x 867 + 1994 x 133 + 133
= 1994 x ( 867+133) + 133
= 1994 x 1000 + 133
= 1994000+ 133
= 1994133
\(1994\times867+1995\times133\)
\(=1994\times867+1994\times133+133\)
\(=1994\times\left(867+133\right)+133\)
\(=1994\times1000+133\)
\(=1994000+133\)
\(=1994133\)
a. 3/5 + 6/11 + 7/13 + 2/5 + 16/11 + 19/13
= ( 3/5 + 2/5 ) + ( 6/11 + 16/11 ) + ( 7/13 + 19/13)
= 1 + 2 + 2
= 5.
a) \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}\)
\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{16}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)\)
\(=1+2+2=5\)
b) \(\frac{1995}{1997}x\frac{1990}{1993}x\frac{1997}{1994}x\frac{1993}{1995}x\frac{997}{995}=\frac{1995x1990x1997x1993x997}{1997x1993x1994x1995x995}=\frac{1990x997}{1994x995}=\frac{995x2x997}{997x2x995}=1\)
a) =(3/5+2/5)+(6/11+16/11)+(19/13+7/13)
=5/5+22/11+26/13
=1+2+3
=6
1995 * 1994 - 1 / 1993 * 1995 + 1994
= 1995 * 1994 - 1 / ( 1994 -1 ) * 1995 + 1994
= 1995 * 1994 - 1 / 1994 * 1995 - 1995 + 1994
= 1995 * 1994 - 1 / 1994 * 1995 - 1
= 1
nhấn đúng cho mk nha