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a)1945*240-1000=465800
945+1945*239=465800
b)637*527-189=335510
526*637+448=335510
= 526 x 637 + 637 - 189 / 526 x 637 + 448
= 526 x 637 + 448 / 526 x 637 + 448
= 1
Tk mk nha
526 x 637 + 448 335510
---------------------------- = ------------------------ = 1
637 x 527 -189 335510
Hok tốt nhé
# EllyNguyen #
a) \(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637+526+448}{526\times637+448}\)
\(=1\)
b) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)
a,
104,4 . x -14,1 . x + 9,6 . x =25
x(104,4 - 14,1 + 9,6 ) = 25
x.99,9 = 25
x = \(\frac{250}{999}\)
b)
\(\frac{2009.2010+2000}{2011.2010-2020}=\frac{2009.2010+2000}{\left(2009+2\right).2010-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+2.2010-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+4020-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+2000}\)
\(=1\)
câu 1
16 x 25 + 44 x 100
29 x 96 + 124 x 48
16 x 25 +44 x 100
=400 + 4400
=4800
29 x 96 +124 x 48
=2784 + 5952
=8736
Vậy 4800
8736
Câu 1: 6 x 25 + 44 x 100
29 x 96 + 142 x 48
Giải :(6 x 25) + (44 x 100) =
150 + 440 = 590
(29 x 96) + (142 x 48) =
2784 + 6816 = 9600
Câu 2 :1994 x 1993 - 1992 x 1993
1992 x 1993 + 1994 x 7 + 1986
Giải : (1994 x 1993) - (1992 x 1993) =
3 974 042 - 3 970 056 = 3986
(1992 x 1993) + (1994 x 7) + 1986 =
3 970 056 + 13 958 + 1986 = 3 986 000
Câu 3 : 399 x 45 + 55 x 399
1995 x 1996 - 1991 x 1995
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times526+527-189}{526\times637-189+637}\)
\(=\frac{1+527-189}{1-189+637}\)
\(=\frac{1-189+527}{1-189+637}\)
\(=\frac{527}{449}=\frac{339}{449}\)
~ Hok tốt ~
trl
=334/449
hok tốt