\(\frac{19}{13}+\frac{14}{6}+\frac{1}{9}+\frac{4}{6}+\frac{7}{13}+\frac{17}{9}\)

\(=\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{14}{6}+\frac{4}{6}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)

\(=\frac{26}{13}+\frac{18}{6}+\frac{18}{9}\)

\(=2+3+2\)

\(=7\)

              \(\frac{315}{316}\times\frac{313}{314}\times\frac{316}{315}\times\frac{317}{314}\)

\(=\left(\frac{315}{316}\times\frac{316}{315}\right)\times\left(\frac{313}{314}\times\frac{317}{314}\right)\)

\(=1\times1,006339\)

\(=1,006339\)

#Chúc bạn học tốt !

#k mình nhé ?

\(\frac{315}{316}\cdot\frac{316}{314}\cdot\frac{316}{315}\cdot\frac{317}{313}=\frac{315.316.316.317}{316.314.315.313}=\frac{1.1.316.317}{1.314.1.313}=\frac{100172}{98282}\)

Ta có : \(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{3}\)

\(=\frac{3}{2}\times\frac{2}{3}\times\frac{4}{5}=1\times\frac{4}{5}\)

\(=\frac{4}{5}\)

Đơn giản như đang giỡn :

=315.313.316.317/315.314.316.317

=313/314

hok tốt k nhé bạn .

    \(\frac{315}{316}\cdot\frac{313}{314}\cdot\frac{316}{315}\cdot\frac{317}{314}\)

= \(\frac{315\cdot313\cdot316\cdot317}{316\cdot314\cdot315\cdot314}\)

=\(\frac{1\cdot313\cdot1\cdot317}{1\cdot314\cdot1\cdot314}\)(Bước này là bước rút gọn)

= \(\frac{99221}{98596}\)

                                     #Kiều

315/316*313/314*316/315*317/313

=315*313*316*317/316*314*315*313

=317/314

Tick cho mik nha

rồi triệt tiêu cho nhau

C=(1+3+3^2)+3^3(1+3+3^2)+...+3^15(1+3+3^2)

=13(1+3^3+...+3^15) chia hết cho 13

Lẹ nha m.n mik cần gấp

mi tích tau tau tích mi xong tau trả lời nka

 việt nam nói là làm

a+5b ⋮ 7
=> 3(a+5b) ⋮7
=> 3a+15b⋮7
=> 3a+15b +7a -14b⋮7
=> 10a+b⋮7
chúc bn hok tốt ^_^

a: TH1: 2x+5y⋮13

=>22x+55y⋮13

=>22x+16y+39y⋮13

=>22x+16y⋮13

=>2(11x+8y)⋮13

=>11x+8y⋮13

=>(2x+5y)(11x+8y)⋮13*13

=>A⋮169(1)

TH2: 11x+8y⋮13

=>22x+16y⋮13

=>22x+16y+39y⋮13

=>22x+55y⋮13

=>11(2x+5y)⋮13

=>2x+5y⋮13

=>(11x+8y)(2x+5y)⋮13*13

=>A⋮169(2)

Từ (1),(2) suy ra A⋮169

b: 4x+7y⋮23

=>44x+77y⋮23

=>44x+8y+69y⋮23

=>44x+8y⋮23

=>4(11x+2y)⋮23

=>11x+2y⋮23

c: 3x+12y⋮13

=>30x+120y⋮13

=>30x+3y+117y⋮13

=>30x+3y⋮13

=>3(10x+y)⋮13

=>10x+y⋮13