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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 \(\frac{1996x1995-996}{1000+1996x1994}\)
=\(\frac{1996x1994+1996-996}{1000+1996x1994}\)
=\(\frac{1000+1996x1994}{1000+1996x1994}\)
=\(1\)
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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.
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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
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co len cac bn oi
mn can trong toi nay ma chua co thay ai tl het á
huhuhuhuhuh
A = 1995 x 1993 - 18 / 1975 + 1993 x 1994
= (1994 + 1) x 1993 - 18 / 1975 + 1993 x 1994
= 1994 x 1993 + 1993 - 18 / 1975 + 1993 x 1994
= 1994 x 1993 + 1975 / 1975 + 1993 x 1994
= 1
A = 1995 x 1993 - 18 / 1975 + 1993 x 1994= (1994 + 1) x 1993 - 18 / 1975 + 1993 x 1994= 1994 x 1993 + 1993 - 18 / 1975 + 1993 x 1994= 1994 x 1993 + 1975 / 1975 + 1993 x 1994= 1