1+2+3+4+5+6+7+8+9+10=55 NHÉ BẠN

1+2+3+4+5+6+7+8+9+10=55

55 NHA

5+18-7 = 16

3/8+1/2-5/24=9/24 +12/24-5/24=16/24=2/3

(16+2/3):(16+2/3)=1

(120/24+9/24+432/24+12/24-168/24-5/24):(48/3+2/3)=-32/24:50/3=-4/3.3/50=-4/50=-2/25

k cho mik nha

hong ai giúp mik dọ? ;-;

a) ta có: \(\frac{-5}{6}=\frac{-10}{12};\frac{-3}{4}=\frac{-9}{12}\)

\(\frac{7}{8}=\frac{357}{408};\frac{7}{24}=\frac{119}{408};\frac{16}{17}=\frac{384}{408};\frac{2}{3}=\frac{272}{408}\)

\(\Rightarrow\frac{-10}{12}< \frac{-9}{12}< \frac{119}{408}< \frac{272}{408}< \frac{357}{408}< \frac{384}{408}\)

\(\Rightarrow\frac{-5}{6}< \frac{-3}{4}< \frac{7}{24}< \frac{2}{3}< \frac{7}{8}< \frac{16}{17}\)

b) ta có: \(\frac{205}{107}=1\frac{98}{107}>1\)\(\frac{-5}{8};\frac{7}{10};\frac{-16}{19};\frac{20}{26}=\frac{10}{13};\frac{214}{315}< 1\)

ta có: \(\frac{-5}{8}=\frac{-95}{152};\frac{-16}{19}=\frac{-128}{152}\)

\(\frac{7}{10}=\frac{5733}{8190};\frac{20}{26}=\frac{10}{13}=\frac{6300}{8190};\frac{214}{315}=\frac{5564}{8190}\)

\(\Rightarrow\frac{205}{107}>\frac{6300}{8190}>\frac{5733}{8190}>\frac{5564}{8190}>\frac{-95}{152}>\frac{-128}{152}\)

=> ...

a, 7\(\dfrac{3}{5}\) : \(x\) = 5\(\dfrac{4}{15}\) - 1\(\dfrac{1}{6}\)

     \(\dfrac{38}{5}\) : \(x\) = \(\dfrac{79}{15}\) - \(\dfrac{7}{6}\)

              \(x\) = \(\dfrac{41}{10}\)

             \(x\) = \(\dfrac{38}{5}\) : \(\dfrac{41}{10}\)

              \(x\) = \(\dfrac{76}{41}\)

b, \(x\) \(\times\) 2\(\dfrac{2}{3}\) = 3\(\dfrac{4}{8}\) + 6\(\dfrac{5}{12}\)

    \(x\) \(\times\) \(\dfrac{8}{3}\)  = \(\dfrac{7}{2}\) + \(\dfrac{77}{12}\)

     \(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{119}{12}\)

     \(x\)          = \(\dfrac{119}{12}\)

     \(x\)          = \(\dfrac{119}{12}\): \(\dfrac{8}{3}\)

     \(x\)           = \(\dfrac{119}{32}\)

a ) 13/20

B)

C..........................................................

minh dang tính

lấy máy tính mà bấm

trả lời kiểu gì vậy hả bạn lê thế trung

= 15/56

3/8 x 5/7 = 15/56
       :)))

3/8 x 5/7 = 15/56 nhé
HT

( 5/4x - 2/3 )^4 = 57/16 + 3/2

=> ( 5/4x - 2/3 )^4 = 81/16

=> ( 5/4x - 2/3 )^4 = 3^4/2^4

=> 5/4x - 2/3 = 3/2

=> 5/3x = 13/6

=> x = 13/10

      Vậy x = 13/10

\(\left(\frac{5}{4}x-\frac{2}{3}\right)^4-\frac{3}{2}=\frac{57}{16}\)

\(\left(\frac{5}{4}x-\frac{2}{3}\right)^4-\frac{3}{2}=\frac{57}{16}+\frac{3}{2}\)

\(\left(\frac{5}{4}x-\frac{2}{3}\right)=\frac{81}{16}\)

Ta xét 2th:

Th1: \(\frac{5}{4}x-\frac{2}{3}=\left(\frac{81}{16}\right)^{\frac{1}{4}}\)

\(\Rightarrow x=\frac{26}{15}\)

Th2: \(\frac{5}{4}x-\frac{2}{3}=-\left(\frac{81}{16}\right)^{\frac{1}{4}}\)

\(\Rightarrow x=-\frac{2}{3}\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{26}{15}\\x=-\frac{2}{3}\end{cases}}\)

\(3-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=2\)

\(3-\left(\frac{43}{8}+x-\frac{173}{24}\right)=2×\frac{50}{3}\)

\(3-\left(\frac{43}{8}+x-\frac{173}{24}\right)=\frac{100}{3}\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right)=3-\frac{100}{3}\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right)=-\frac{91}{3}\)

\(\frac{43}{8}+x=-\frac{91}{3}+\frac{173}{24}\)

\(\frac{43}{8}+x=-\frac{185}{8}\)

\(x=-\frac{185}{8}-\frac{43}{8}\)

\(x=-\frac{57}{2}\)

vậy \(x=-\frac{57}{2}\)

nhầm 

\(3-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=2\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=3-2\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=1\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right)=1×\frac{50}{3}\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right)=\frac{50}{3}\)

\(\frac{43}{8}+x=\frac{50}{3}+\frac{173}{24}\)

\(\frac{43}{8}+x=\frac{191}{8}\)

\(x=\frac{191}{8}-\frac{43}{8}\)

\(x=\frac{37}{2}\)

vậy \(x=\frac{37}{2}\)