(7-23-14)-(43-104)-(54-13)

=7-23-13-43+104-54+13

=-9

`(-2/5)^{x}-1=-21/25

`(-2/5)^{x}=-21/25+1

`(-2/5)^{x}=4/25`

`(-2/5)^{x}=(-2/5)^2`

`x=2`

O A B C M N

\(\widehat{AOM}+\widehat{MOC}=\widehat{BON}+\widehat{NOC}\\ \Rightarrow\widehat{AOC}=\widehat{BOC}\\ \)

Vì \(\widehat{AOC}+\widehat{BOC}=180^0\Rightarrow\widehat{AOC}=\widehat{BOC}=\dfrac{180^0}{2}=90^0\\ \Rightarrow OC\perp AB\)

\(\sqrt{11^2-72}-1\dfrac{1}{2}:\sqrt{\dfrac{25}{4}}-\left(\dfrac{2021}{2022}\right)^0\)

\(=\sqrt{121-72}-\dfrac{3}{2}:\dfrac{5}{2}-1\)

\(=\sqrt{49}-\dfrac{3}{5}-1\)

\(=7-\dfrac{3}{5}-1\)

\(=\dfrac{32}{5}-1\\ \)

\(=\dfrac{27}{5}\)

\(5-3x+0,25=\dfrac{3}{4}-1,25\\ \Leftrightarrow5,25-3x=0,75-1,25\\ \Leftrightarrow3x=5,25-0,75+1,25\\ \Leftrightarrow3x=5,75\\ \Rightarrow x=5,75:3=\dfrac{575}{100}:3=\dfrac{23}{4}:3=\dfrac{23}{12}\)

\(\dfrac{1}{2}x+\dfrac{3}{2}x+\dfrac{7}{3}=-\dfrac{4}{3}\\ =>\left(\dfrac{1}{2}+\dfrac{3}{2}\right)x=-\dfrac{4}{3}-\dfrac{7}{3}\\ =>\dfrac{4}{2}x=-\dfrac{11}{3}\\ =>x=\left(-\dfrac{11}{3}\right):2\\ =>x=-\dfrac{11}{6}\)

244.244=59536

chúc bn học tốt

Số tiền cả gốc lẫn lãi là 

50000000.(1+0,065)=53250000 đ

mà rút đi 1\5 số tiền :

53250000.\(\dfrac{1}{5}\)=10650000đ

Số tiền còn lại là :

53250000-10650000=4260000 đ

lam sao thay dc cau tra loi vay

x = \(\dfrac{2}{-5}\) = - \(\dfrac{2}{5}\) = \(\dfrac{-14}{35}\)  > \(\dfrac{-15}{35}\) = - \(\dfrac{3}{7}\)

x > y