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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) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)
\(\frac{64X50+44X100}{27X38+146X19}=\frac{64X50+44X2X50}{27X2X38+146X19}=\frac{64X50+88X100}{54X38+146X19}=\frac{50X\left(64+88\right)}{19X\left(54+146\right)}=\frac{50X152}{19X200}\)\(=\frac{̸5̸̸0X152}{19X4X̸5̸0}=\frac{152}{76}=2\) Đáp số :2
64x100+50x44
=2200+6400
=8600
1026+2774
=3800
mình làm đúng ko vậy
TL:
= 3800
nhé
K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN
~~HT~~
Ta có: \(\frac{1}{10.11}+\frac{1}{11.12}+....+\frac{1}{49.50}\)
\(\Rightarrow\frac{1}{10}-\frac{1}{11}+\frac{1}{11}-\frac{1}{12}+....+\frac{1}{49}-\frac{1}{50}\)
\(=\frac{1}{10}-\frac{1}{50}\)
\(=\frac{2}{25}\)
\(\frac{1}{1.3.7}+\frac{1}{3.7.9}+\frac{1}{7.9.13}+\frac{1}{9.13.15}+\frac{1}{13.15.19}\)
\(=\frac{1}{2}\left(\frac{1}{1.3}-\frac{1}{3.7}+\frac{1}{3.7}-\frac{1}{7.9}+...+\frac{1}{13.15}-\frac{1}{15.19}\right)\)
\(=\frac{1}{2}\left(\frac{1}{1.3}-\frac{1}{15.19}\right)=\frac{47}{285}\)
TL:
\(\frac{12}{100}\)= 0,12
\(\frac{5}{100}\)= 0,05
\(\frac{306}{1000}\)= 0,306
-HT-
\(\dfrac{64\text{x}50+44+100}{27\text{x}38+146\text{x}19}\)
\(=\dfrac{3200+144}{19\text{x}\left(27\text{x}2+146\right)}=\dfrac{3344}{19\text{x}200}\)
\(=\dfrac{3344}{3800}=\dfrac{22}{25}\)