câu a : 

\(\dfrac{-8}{24}+\dfrac{-4}{12}=\dfrac{-1}{3}+\dfrac{-1}{3}=\dfrac{-2}{3}\)

câu b : 

\(\dfrac{-20}{35}+\dfrac{16}{24}=\dfrac{-4}{7}+\dfrac{2}{3}=\dfrac{2}{21}\)

câu c : 

\(\dfrac{-3}{9}+\dfrac{-6}{15}=\dfrac{-1}{3}+\dfrac{-2}{5}=\dfrac{-11}{15}\)

câu d : 

\(\dfrac{3}{13}-\dfrac{4}{10}=\dfrac{3}{13}-\dfrac{2}{5}=\dfrac{-11}{65}\)

câu e : 

\(\dfrac{5}{17}-\dfrac{9}{15}=\dfrac{5}{17}-\dfrac{3}{5}=\dfrac{-26}{85}\)

câu g : 

\(\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{3}{-9}=\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{-3}{9}\\ =\dfrac{1}{2}-\dfrac{2}{5}+\dfrac{-1}{3}=\dfrac{-7}{30}\)

câu h : 

\(\dfrac{5}{4}-\dfrac{1}{2}+\dfrac{-7}{8}=\dfrac{10}{8}-\dfrac{4}{8}+\dfrac{-7}{8}=\dfrac{-1}{8}\)

d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37

=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37

=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37

=43/37.1+31/37=43/37.1+31/37

=2=2

E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12

=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12

=−5/24.1+7/12=−5/24.1+7/12

=3/8=3/8

a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7

=3/7−−11/14−2=3/7−−11/14−2

=3/7+11/14−2=3/7+11/14−2

=−11/14=−11/14

b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14

=4/5−3/7=4/5−3/7

=13/35

d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37

=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37

=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37

=43/37.1+31/37=43/37.1+31/37

=2=2

E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12

=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12

=−5/24.1+7/12=−5/24.1+7/12

=3/8=3/8

a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7

=3/7−−11/14−2=3/7−−11/14−2

=3/7+11/14−2=3/7+11/14−2

=−11/14=−11/14

b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14

=4/5−3/7=4/5−3/7

=13/35

\(-x-\frac{1}{9}=\frac{-2}{15}\)

\(-x=\frac{-2}{15}+\frac{1}{9}\)

\(-x=\frac{-6}{45}+\frac{5}{45}\)

\(-x=\frac{-1}{45}\)

\(x=\frac{1}{45}\)

\(\left|x+\frac{5}{6}\right|=\frac{11}{24}\)

\(\orbr{\begin{cases}x+\frac{5}{6}=\frac{11}{24}\\x+\frac{5}{6}=\frac{-11}{24}\end{cases}}\)

\(\orbr{\begin{cases}x=\frac{11}{24}-\frac{5}{6}\\x=\frac{-11}{24}-\frac{5}{6}\end{cases}}\)

\(\orbr{\begin{cases}x=\frac{11}{24}-\frac{20}{24}\\x=\frac{-11}{24}-\frac{20}{24}\end{cases}}\)

\(\orbr{\begin{cases}x=-\frac{3}{8}\\x=-\frac{31}{24}\end{cases}}\)

Vậy \(x=-\frac{3}{8}\) hoặc \(x=-\frac{31}{24}\)

   - x - 1/9      = -2/15

   -x               = -2/15  + 1/9

   -x               = -18/135 + 15/135

   -x               = ( -18 ) + 15 / 135 

   -x               = -3 / 135 = -1/45

=> x = 1/45

| x + 5/6 | = 11/24

x + 5/6    = 11/24

x            = 11/24 - 5/6

x            = 11/24 + ( - 5 ) /6 

x            = 66/144 + - 120 / 144

x            = 66 + ( - 120 )/ 144

x            = -54 /144 = -3/8

tk k nha( nếu đúng)

hihi  mơn m.n nhiều lắm !!!!!!!!!! 

2¹³ . 4⁵ . 8²=2¹³.(2²)⁵.(2³)²=2¹³.2¹⁰.2⁶=2^13+10+6=2¹⁹

100⁶ . 1000⁴ . 10000³=(10²)⁶.(10³)⁴.(10⁴)³=10¹².10¹².10¹²=10^12+12+12=10³⁶

36 ⁹ : 18⁹=(36:18)⁹=2⁹

24⁵ : 6⁵ . 8⁸=(24:6)⁵.8⁸=4⁵.8⁸=(2²)⁵.(2³)⁸=2¹⁰.2²⁴=2¹⁰⁺²⁴=2³⁴

5¹⁵ . 125³ : 625=5¹⁵.(5³)³.5⁴=5¹⁵.5⁹.5⁴=5¹⁵⁺⁹⁺⁴=5²⁸

28²⁰¹⁴ : 7²⁰¹⁴ : 6⁰=(28:7)²⁰¹⁴ : 1=4²⁰¹⁴:1=4²⁰¹⁴

24 . 5⁵ + 5² . 5³=24.5⁵+5²⁺³=24.5⁵+5⁵=(24+1).5⁵=25.5⁵=5².5⁵=5²⁺⁵=5⁷

7 . 3⁹ + 3¹⁰ + 51 . 3⁸=7.3.3⁸ + 3².3⁸ + 51 . 3⁸=21.3⁸ + 9.3⁸ + 51 . 3⁸=(21+9+51).3⁸=81.3⁸=3⁴.3⁸=3⁴⁺⁸=3¹²

10(81+19)+100+50(91+9)
=10.100+100+50.100
=1000+100+5000
=6100

=14.5.35+10.5.5.7+4.5.7

=70.35+50.35+4.35

=35.(70+50+4)

=35.124

=4340

\(-7\left(5-x\right)-2\left(x-10\right)=15\)

\(\Leftrightarrow-35+7x-2x+20=15\)

\(\Leftrightarrow5x-5=15\)

\(\Leftrightarrow5x=20\)

\(\Leftrightarrow x=4\)

Vậy \(x=4\)

\(4\left(x-1\right)-3\left(x-2\right)=-|-5|\)

\(\Leftrightarrow4x-4-3x+6=-5\)

\(\Leftrightarrow x+2=-5\)

\(\Leftrightarrow x=-7\)

Vậy \(x=-7\)

~ học tốt ~