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a: \(\dfrac{-11}{81}=\dfrac{1}{27}\cdot\dfrac{-11}{3}\)
b: \(\dfrac{-11}{81}=\dfrac{1}{27}:\dfrac{3}{-11}\)
Bài 1:
a, Ta có:
\(\dfrac{-8}{15}=-\dfrac{5}{18}+-\dfrac{1}{6}\)
b, Ta có:
\(-\dfrac{8}{15}=\dfrac{11}{15}-\dfrac{19}{15}\)
Bài 2:
a, \(\dfrac{11}{13}-\left(\dfrac{5}{12}-x\right)=-\left(\dfrac{15}{18}-\dfrac{11}{13}\right)\)
\(\Rightarrow\dfrac{11}{13}-\dfrac{5}{12}+x=-\dfrac{15}{18}+\dfrac{11}{13}\)
\(\Rightarrow x=-\dfrac{15}{18}+\dfrac{11}{13}+\dfrac{5}{12}-\dfrac{11}{13}\)
\(\Rightarrow x=-\dfrac{15}{8}+\dfrac{5}{12}=-\dfrac{35}{24}\)
b, \(2x-3=x+\dfrac{1}{2}\)
\(\Rightarrow2x-x=\dfrac{1}{2}+3\Rightarrow x=\dfrac{7}{2}\)
Chúc bạn học tốt!!!
Bài 2:
a: =>11/13-5/42+x=15/18+11/13
=>x-5/42=15/18
=>x=5/6+5/42=35/42+5/42=40/42=20/21
b: 2x-3=x+1/2
=>2x-x=3+1/2
=>x=7/2
Dễ lắm
a) 1 . -13 hay -1 .13
b) -15 .1
-3 .5
-5 .3
-1 .15
c) -27 .1; -1 .27; -9 . 3; -3. 9
\(-13=-1.13\)
\(-15=-3.5=-1.15\)\(=-15.1\)
\(-27=-1.27=-3.9=-9.3\)
học tốt
1.
a) \(-\frac{15}{17}>-\frac{19}{21}\)
b)\(-\frac{13}{19}>-\frac{19}{23}\)
c)\(-\frac{23}{49}>-\frac{25}{47}\)
d)\(\frac{317}{633}>\frac{371}{743}\)
e)\(-\frac{24}{35}< -\frac{19}{30}\)
f)\(\frac{12}{17}< \frac{13}{18}\)
g) \(-\frac{17}{26}< -\frac{16}{27}\)
h) \(\frac{84}{-83}< -\frac{337}{331}\)
i) \(-\frac{1941}{1931}< -\frac{2011}{2001}\)
j) \(-\frac{1930}{1945}>-\frac{1996}{2001}\)
k) \(\frac{37}{59}< \frac{47}{59}\)
I) \(-\frac{25}{124}>-\frac{27}{100}\)
m) \(-\frac{97}{201}>-\frac{194}{309}\)
n) \(-\frac{189}{398}< -\frac{187}{394}\)
o) \(-\frac{289}{403}>-\frac{298}{401}\)
1. 3/4=1/2 +1/4
2.-7/12 = -1/3 + -1/4
chán rồi chỉ làm thế thui
1)
-2/15 < 0
-10/-11 > 0
nên x < y
2)
ví dụ 1 < 2 => -1 > -2
ta có 16/29 < 16/27 < 19/27
suy ra -16/29 > -16/27 > -19/27
\(\dfrac{-13}{15}=\dfrac{-13}{5}\cdot\dfrac{1}{3}=\dfrac{-13}{5}:3\)
\(\dfrac{-2}{11}=-2\cdot\dfrac{1}{11}=-2:11\)