\(x\times9,6+x:2,5=45\\ x\times9,6+x\times0,4=45\\ x\times\left(9,6+0,4\right)=45\\ x\times10=45\\ x=45:10\\ x=4,5\)

tìm x nhá 

\(9,6x+x:2,5=45\\ \Leftrightarrow\left(9,6+0,4\right)x=45\\ \Leftrightarrow x=4,5\)

Vậy x = 4,5.

số tiếp theo là 1697

Cảm ơn bn nha

\(\left(x+\dfrac{1}{3}\right)\times\dfrac{9}{14}\times\dfrac{7}{3}-\dfrac{1}{3}=1:\dfrac{9}{5}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}-\dfrac{1}{3}=\dfrac{5}{9}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{5}{9}+\dfrac{1}{3}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{8}{9}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{8}{9}:\dfrac{3}{2}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{16}{27}\\ \Rightarrow x=\dfrac{16}{27}-\dfrac{1}{3}\\ \Rightarrow x=\dfrac{7}{27}\)

(x-1)/2015 + x/2014 + 1/503 - (x-3)/2013 - x/2012 - 1/1007 =0

(x-2016)/2015  + (x-2016)/2014 - (x-2016)/2012 - (x-2016)/2013 = 0

(x-2016) ( 1/2015 + 1/2016 - 1/2013 - 1/2012) = 0

Mà 1/2015 + 1/2016 - 1/2013 - 1/2012 khác 0

Suy ra x -2016=0

x=2016

Chỗ nào thắc mắc nhớ hỏi mik nhe!

sssssssssssssssssssssssssssssssssssssssssssssssssssss

\(50\%+\dfrac{1}{2}+\dfrac{1}{7}\times\dfrac{2}{5}+\dfrac{1}{7}\times\dfrac{3}{5}\)

\(=\dfrac{1}{2}+\dfrac{1}{2}+\dfrac{2}{35}+\dfrac{3}{35}\)

\(=1+\dfrac{5}{35}\)

\(=1+\dfrac{1}{7}\)

\(=\dfrac{8}{7}\)

\(50\%+\dfrac{1}{2}+\dfrac{1}{7}x\dfrac{2}{5}+\dfrac{1}{7}x\dfrac{3}{5}\)

\(=\dfrac{1}{2}+\dfrac{1}{2}+\dfrac{1}{7}x\left(\dfrac{2}{5}+\dfrac{3}{5}\right)\)

\(=1+\dfrac{1}{7}x1\)

\(=\dfrac{7}{7}+\dfrac{1}{7}=\dfrac{8}{7}\)

50% + 1/2 + 1/7 × 2/5 + 1/7 × 3/5

= 1/2 + 1/2 + 1/7 × (2/5 + 3/5)

= 1 + 1/7 × 1

= 1 + 1/7

= 7/7 + 1/7

= 8/7

8/7

(5765-325) x 1675

=5440 x 1675

=9112000

(5765 - 325) x 1675 = 5765 x 1675 - 325 x 1675

                                = 9656375 - 544375

                                = 9112000

Chúc bạn học thật tốt !!!!

Nguyen Minh Hang và Chu Minh Bảo ơi, mik thấy cách đó ko được nhanh cho lắm!!!