x chia 7;8;9 đều dư 2

=>\(x-2\in BC\left(7;8;9\right)\)

=>\(x-2\in B\left(504\right)\)

=>\(x-2\in\left\{504;1008;...\right\}\)

mà 100<=x<=999

nên x-2=504

=>x=506

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will hold ạ

Vì có next Friday á

Tick cho tui nha

will be held nhé

235 chia x dư 14

=>235-14 chia hết cho x

=>221 chia hết cho x

=>\(x\in\left\{1;13;17;221\right\}\)

mà 235 chia x dư 14

nên \(x\in\left\{17;221\right\}\)

\(2,5\left(4,1-3,6-2,5+9,1\right)+2,4:2\)

\(=2,5\cdot\left(0,5-2,5+9,1\right)+1,2\)

\(=2,5\cdot7,1+1,2=18,95\)

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Nếu không khuyến mãi thì khi mua \(4\) sản phẩm cùng loại sẽ phải trả tiền \(4\) sản phẩm

Khi có khuyến mãi, mua \(4\) sản phẩm cùng loại chỉ trả tiền \(3\) sản phẩm, khi đó giá sản phẩm sau khuyến mãi là: \(\dfrac{3}{4}=75\%\) giá ban đầu

Vậy số phần trăm được giảm là: \(100\%-75\%=25\%\)

a, \(-\dfrac{3}{7}\times\dfrac{15}{13}-\dfrac{3}{7}\times\dfrac{11}{13}-\dfrac{3}{7}\)

\(=-\dfrac{3}{7}\times\left(\dfrac{15}{13}+\dfrac{11}{13}+1\right)\)

\(=-\dfrac{3}{7}\times\left(\dfrac{26}{13}+1\right)\)

\(=-\dfrac{3}{7}\times\left(2+1\right)\)

\(=-\dfrac{3}{7}\times3=-\dfrac{9}{7}\)

b, \(\dfrac{5}{6}+\dfrac{1}{6}:\dfrac{4}{3}\)

\(=\dfrac{5}{6}+\dfrac{1}{6}\times\dfrac{3}{4}\)

\(=\dfrac{20}{24}+\dfrac{3}{24}=\dfrac{23}{24}\)

c, \(\left(\dfrac{5}{7}-\dfrac{3}{4}\right)-\dfrac{7}{4}\)

\(=\dfrac{5}{7}-\dfrac{3}{4}-\dfrac{7}{4}\)

\(=\dfrac{5}{7}-\left(\dfrac{3}{4}+\dfrac{7}{4}\right)\)

\(=\dfrac{5}{7}-\dfrac{10}{4}\)\(=\dfrac{5}{7}-\dfrac{5}{2}\)

\(=\dfrac{10}{14}-\dfrac{35}{14}=\dfrac{-25}{14}\)

d, \(-\dfrac{6}{5}-\dfrac{2}{3}=-\dfrac{18}{15}-\dfrac{10}{15}=-\dfrac{28}{15}\)

e, \(\dfrac{3}{4}+\dfrac{1}{4}:\left(1-\dfrac{1}{4}\right)\)

\(=\dfrac{3}{4}+\dfrac{1}{4}:\dfrac{3}{4}\)

\(=\dfrac{3}{4}+\dfrac{1}{4}\times\dfrac{4}{3}\)

\(=\dfrac{3}{4}+\dfrac{1}{3}=\dfrac{9}{12}+\dfrac{4}{12}=\dfrac{13}{12}\)

f, \(-\dfrac{3}{8}\times\dfrac{12}{13}-\dfrac{3}{8}\times\dfrac{14}{13}\)

\(=-\dfrac{3}{8}\times\left(\dfrac{12}{13}+\dfrac{14}{13}\right)\)

\(=-\dfrac{3}{8}\times\dfrac{26}{13}\)\(=-\dfrac{3}{8}\times2=-\dfrac{6}{8}\)

a)= \(\dfrac{-9}{7}\)

b)= \(\dfrac{23}{34}\)

c)=-\(\dfrac{5}{3}\)

d)=-28/15