ai tính song là banh não

Tớ ko bít phải làm sao bây giờ ?

tô ? ko ? bít ?

-_-!  ai thick tích cu  !

bạn bấm máy tính cầm tay là ra liền à =))

cảm ơn bạn nha

a) \(x+\frac{18}{5}=\frac{43}{4}\)

\(x=\frac{43}{4}-\frac{18}{5}\)

\(x=\frac{143}{20}=7,15\)

b) \(x-4,2=42,19\)

\(x=42,19+4,2\)

\(x=46,39\)

a) 143/20

b) 46,39

\(\frac{45\times43+18}{45\times44-27}\)

= \(\frac{45\times43+18}{45\times\left(43+1\right)-27}\)

= \(\frac{45\times43+18}{45\times43+45-27}\)

= \(\frac{45\times43+18}{45\times43+\left(45-27\right)}\)

= \(\frac{45\times43+18}{45\times43+18}\)

= 1

\(6\frac{1}{7}x1\frac{6}{43}\)

= \(\frac{43}{7}x\frac{49}{43}\)

= \(\frac{49}{7}\)

= 7

43/7 * 49/43= 7

a) 8/6 > 1 

    42/43 < 1 

=>8/6 > 42/43

b) 17/18 < 1

   4/3 > 1 

=> 17/18 < 4/3 

10:5/3= 10x3/5=6

5/3:10=5/3x1/10=1/6

12/35:35/25=12/35x25/35=300/1225=12/49

19/17:76/51=19/17x 51/76= 3/4

\(10:\frac{5}{3}=10x\frac{3}{5}=\frac{30}{5}=6\)

\(\frac{5}{3}:10=\frac{5}{3}x\frac{1}{10}=\frac{5}{30}=\frac{1}{6}\)

\(\frac{12}{35}:\frac{35}{25}=\frac{12}{35}x\frac{25}{35}=\frac{12}{35}x\frac{5}{7}=\frac{12}{7}x\frac{1}{7}=\frac{12}{49}\)

\(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}x\frac{51}{76}=\frac{1}{1}x\frac{3}{4}=\frac{3}{4}\)

Thank you! Chúc bạn học tốt!