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![](https://rs.olm.vn/images/avt/0.png?1311)
\(b=\frac{637.527-189}{526.637+448}\)
\(b=\frac{637.\left(526+1\right)-189}{526.637+448}\)
\(b=\frac{637.526+\left(637-189\right)}{526.637+448}\)
\(b=\frac{637.526+448}{526.637+448}=1\)
Dấu . là nhân nha
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=335918.116
(thực hiện phép nhân, chia trước nha)
Học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
42x13-22x5+42x7-15x22
= 42 x (13+7) - 22 x (5+15)
= 42 x 20 - 22 x 20
= 20 x (42 - 22)
= 20 x 20 = 400
___
37x39+78x74+13x85+52x55
= 37 x 3 x 13 + 13 x 6 x 74 + 13 x 85 + 13 x 4 x 55
= 13 x (37 x 3+ 74 x 6+ 85 + 4 x 55)
= 13 x (111 + 444 + 85 + 220)
= 13 x 860 = 11180
(637x527-189):(526x637+448)
= (637 x 526 + 637 - 189): (526 x 637 + 448)
= (637 x 526 + 448) : (526 x 637 + 448) = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
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) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
526 x 637 + 448 335510
---------------------------- = ------------------------ = 1
637 x 527 -189 335510
Hok tốt nhé
# EllyNguyen #
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times526+527-189}{526\times637-189+637}\)
\(=\frac{1+527-189}{1-189+637}\)
\(=\frac{1-189+527}{1-189+637}\)
\(=\frac{527}{449}=\frac{339}{449}\)
~ Hok tốt ~
![](https://rs.olm.vn/images/avt/0.png?1311)
= 526 x 637 + 637 - 189 / 526 x 637 + 448
= 526 x 637 + 448 / 526 x 637 + 448
= 1
Tk mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a)1945*240-1000=465800
945+1945*239=465800
b)637*527-189=335510
526*637+448=335510
\(\frac{637.527-189}{526.637+448}=1\)