e.

$\frac{8}{23}.\frac{46}{24}=\frac{1}{3}x$

$\frac{2}{3}=\frac{1}{3}x$

$x=\frac{2}{3}: \frac{1}{3}=2$

f.

$\frac{1}{5}:x=\frac{1}{5}-\frac{1}{7}=\frac{2}{35}$

$x=\frac{1}{5}: \frac{2}{35}=\frac{7}{2}$

g.

$\frac{4}{9}-(x-\frac{1}{2})^2=\frac{1}{3}$

$(x-\frac{1}{2})^2=\frac{4}{9}-\frac{1}{3}=\frac{1}{9}=(\frac{1}{3})^2=(\frac{-1}{3})^2$

$\Rightarrow x-\frac{1}{2}=\frac{1}{3}$ hoặc $x-\frac{1}{2}=\frac{-1}{3}$
$\Rightarrow x=\frac{1}{3}+\frac{1}{2}=\frac{5}{6}$ hoặc $x=\frac{-1}{3}+\frac{1}{2}=\frac{1}{6}$

h.

$3,2x-(\frac{4}{5}+\frac{2}{3}):3\frac{2}{3}=\frac{7}{20}$

$3,2x-\frac{2}{5}=\frac{7}{20}$

$3,2x=\frac{7}{20}+\frac{2}{5}=\frac{3}{4}$

$x=\frac{3}{4}: 3,2=\frac{15}{64}$

i.

$(4\frac{1}{2}-2x).1\frac{4}{61}=6\frac{1}{2}$

$(\frac{9}{2}-2x).\frac{65}{61}=\frac{13}{2}$

$\frac{9}{2}-2x=\frac{13}{2}: \frac{65}{61}=\frac{61}{10}$

$2x=\frac{9}{2}-\frac{61}{10}=\frac{-8}{5}$

$x=\frac{-8}{5}:2 =\frac{-4}{5}$

a.

$\frac{5}{7}-\frac{3}{7}x=1$

$\frac{3}{7}x=\frac{5}{7}-1=\frac{-2}{7}$

$x=\frac{-2}{7}: \frac{3}{7}=\frac{-3}{2}$

b.

$x-\frac{-3}{4}=\frac{-14}{25}$

$x=\frac{-14}{25}+\frac{-3}{4}=\frac{-131}{100}$

c.

$\frac{-5}{20}-x=\frac{-7}{5}$

$x=\frac{-5}{20}-\frac{-7}{5}=\frac{23}{20}$

d.

$x+\frac{3}{4}=\frac{36}{144}.\frac{-12}{9}=\frac{-1}{3}$
$x=\frac{-1}{3}-\frac{3}{4}=\frac{-13}{12}$

a: \(42\cdot102-43\cdot17-42\cdot34\)

\(=42\left(102-34\right)-43\cdot17\)

\(=168\cdot17-42\cdot17\)

\(=17\cdot126=2142\)

c: \(3\cdot42-22\cdot3=3\cdot20=60\)

Bài 4:

b: \(2^3\cdot2^2\cdot2^3=2^8\)

c: \(x^7\cdot x^4\cdot x^3=x^{14}\)

d: \(4^9:4^4=4^5\)

Hình bé quá, em đăng tách ra từng bài một nhé!

số bé quá ko thấy

a) Ư(24) = {-24; -12; -8; -6; -4; -3; -2; -1; 1; 2; 3; 4; 6; 8; 12; 24}

Do x là ước của 24 và x > 8 nên x = 12; x = 24

b) 3x + 2 . (-7) = 10

3x - 14 = 10

3x = 10 + 14

3x = 24

x = 24 : 3

x = 8

c) -15 - x = 12 - (-14)

-15 - x = 26

x = -15 - 26

x = -41

e: =113+87-64-26

=200-90=110

f: =244+66-152-48

=310-200

=110

g: =437-437+123-33

=123-33

=90

h: =599-499+387

=387+100

=487

i: =4*25*8*125

=100*1000

=100000

k: =2*5*3*19

=57*10

=570

l: =78(7+3)

=78*10=780

m: =64(49-39)

=64*10=640

n: =19(41+59)

=19*100

=1900

e: =113+87-64-26

=200-90=110
sao 64-26 lại bằng 90 ạ?
có nhầm khum ạ

1) -x - 3 = 7

-x = 7 + 3

-x = 10

x = -10

2) x + 5 = -10

x = -10 - 5

x = -15

3) 2x - 7 = 713

2x = 713 + 7

2x = 720

x = 720 : 2

x = 360

4) -129 - (35 - x) = 55

35 - x = -129 - 55

35 - x = -184

x = 35 - (-184)

x = 219

5) 103 - x = 16 - (13 - 8)

103 - x = 16 - 5

103 - x = 11

x = 103 - 11

x = 192