5 + 5 + 3 - 2 = 11 nha bạn ! 

chúc bạn học tốt , đạt nhiều thành tích !

11 nha bn

= ( 8 - y )( 35x - 14y )

\(\frac{1}{2}+\frac{1}{14}+\frac{1}{35}+\frac{1}{65}+...+\frac{1}{4850}\)

\(=\frac{2}{4}+\frac{2}{28}+\frac{2}{70}+\frac{2}{130}+...+\frac{2}{9700}\)

\(=2.\left(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+\frac{1}{10.13}+...+\frac{1}{97.100}\right)\)

\(=\frac{2}{3}.\left(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+...+\frac{3}{97.100}\right)\)

\(=\frac{2}{3}.\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+...+\frac{1}{97}-\frac{1}{100}\right)\)

\(=\frac{2}{3}.\left(1-\frac{1}{100}\right)\)

\(=\frac{2}{3}.\frac{99}{100}=\frac{33}{50}\)

\(55x55=3025\)k mình nha

http://olm.vn/hoi-dap/question/673092.html

vào đó đi ! mik có giải cho 1 người rùi đó ! theo đó mà làm ! tích đúng cho mik nha bn ! share với mấy đứa hông bít lun ! 
khụ khụ ! 

\(\frac{33}{27}hchominh\)

thua 1 =x ; thua 2 = 18-x

1,1x + 1,12 (18-x) =20 

1,1x -1,12x = 20- 20,16

x = 8 tấn

thua2 = 10 tấn

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#Lemon

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