câu a thì lấy 15400:25 là được.

a) \(15400:x=25\)

\(\Rightarrow x=15400:25\)

\(\Rightarrow x=616\)

b) \(\left(x+3\right):247=675:135\)

\(\Rightarrow\left(x+3\right):247=5\)

\(\Rightarrow x+3=5\times247\)

\(\Rightarrow x+3=1235\)

\(\Rightarrow x=1235-3\)

\(\Rightarrow x=1232\)

c) \(1224:\left(x-8\right)=24\)

\(\Rightarrow\left(x-8\right)=1224:24\)

\(\Rightarrow x-8=51\)

\(\Rightarrow x=51+8\)

\(\Rightarrow x=59\)

bài tập tết

giúp mình với

d) 135(-12 + 247) - 147(135 - 12)= -12.135 + 135.147 - 147.135 + 12.147 = (-12.135 + 12.147) + (135.147 - 147.135) = 12(-135 + 147) + 0 = -12.12 = -144

Bài 1:

a) [3.(-2) - (-8)].(-7) - (-2).(-5) = -7(-6 + 8) - 2.5= -7.2 - 2.5 = -2(7 + 5) = -2.12 = -24

\(3-\left(x-1\right)=2-2\left(x-3\right)\)

\(3-x+1=2-2x+6\)

\(4-x=8-2x\)

\(4-x-8+2x=0\)

\(x-4=0\)

\(x=4\)

3-(x-1)=2-2(x-3)=>3-2=x-1-2(x-3)=>1=x-1-2x+6

=>1=-x+5=>-x=1-5=-4=>x=4

Chúc bạn học tốt nhớ k cho mik nha.

a) 135 + x -135 = 0 => (135 - 135) + x = 0 => x = 0.

b) -562 - x + 562 = 0 => (-562 + 562) - x = 0 => - x = 0 => x = 0.

c) 61 + x - 23 = 91=> (61 - 23) + x = 91=>38 + x = 91=> x = 53.

d) 11 + 53 - x = 97 => 64 - x = 97 => x = 64 - 97 => x = - 33

\(\left(x-1\right)^3-\left(\dfrac{2}{2023}-\dfrac{7}{247}+\dfrac{1}{8}\right)=\dfrac{7}{247}-\dfrac{2}{2023}\)

\(\Rightarrow\left(x-1\right)^3-\dfrac{2}{2023}+\dfrac{7}{247}-\dfrac{1}{8}=\dfrac{7}{247}-\dfrac{2}{2023}\)

\(\Rightarrow\left(x-1\right)^3=\dfrac{7}{247}-\dfrac{7}{247}-\dfrac{2}{2023}+\dfrac{2}{2023}+\dfrac{1}{8}\)

\(\Rightarrow\left(x-1\right)^3=\dfrac{1}{8}\)

\(\Rightarrow\left(x-1\right)^3=\left(\dfrac{1}{2}\right)^3\)

\(\Rightarrow x-1=\dfrac{1}{2}\)

\(\Rightarrow x=\dfrac{1}{2}+1\)

\(\Rightarrow x=\dfrac{3}{2}\)

Lời gải:

$(x-1)^3=\frac{7}{247}-\frac{2}{2023}+\frac{2}{2023}-\frac{7}{247}+\frac{1}{8}=\frac{1}{8}$

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

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

  Trả lời :

 135 + 247 = 382.

 918 - 452 = 466.

 213 x 4 = 852.

855 : 19 = 45.

  Hihi❤️

Trl :

 Bạn tự đặt câu hỏi r tự làm à !

????

a) 125-(-75)+32-(48+32) = 125 + 75 + 32 - 48 - 32 = 200 - 48 = 152

b) 47.347+347.(-47) = 347.( 14 - 47 ) = 347 . 0 = 0

c) x-10=-14

x = -14 +10

x = -4

d) 15 + x = 13

x = 13 - 15

x = -2

e) 25 . x = -75

x = -75/25

x = -3

g) 5x - 16 = -46

5x = -46 + 16

5x = - 30

x = -6

i) 3x - (-11) = -4

3x + 11 = -4

3x = -4 - 11

3x = -15

x = -5

hok tốt!!