18*(5773+2457)+5310*6

=18 *8230+53108*6

=18*(8230+53108)*6

=18*61238*6

=11102184*6

=6613104

k cho mình nha

NGU THẾ HẢ LINH

\(3\times145+3\times\dfrac{55}{6}\times215+6\times85\)

\(=3\times145+3\times\dfrac{55}{6}\times215+3\times2\times85\)

\(=3\times\left(145+\left(\dfrac{55}{6}\times215\right)+\left(2\times85\right)\right)\)

\(=3\times\left(145+\dfrac{11825}{6}+170\right)\)

\(=3\times\dfrac{13715}{6}=6857,5\)

3*(145+55):6*(215+85)

3*200:6*300

600:6*300

100*300=30000

à nhầm

=870+165/1290+390

=1035/1680

=\(\frac{69}{112}\)

hình như bạn chép sai đề phải ko

nhớ kết bạn nha

a) = \(\frac{5\cdot7\cdot8\cdot9\cdot10}{7\cdot8\cdot9\cdot10\cdot11}\)

    = \(\frac{5}{11}\) gạch hết các chữ số 7 , 8 , 9 , 10.

b) = \(\frac{3\cdot145+3\cdot55}{6\cdot215+6\cdot85}\)

   = \(\frac{3\cdot\left(145+55\right)}{6\cdot\left(215+85\right)}\)

   = \(\frac{3\cdot200}{6\cdot300}\)

   = \(\frac{1}{3}\)

Mình hỏi bạn Nguyễn Gia Huy dấu chấm là gì

dấu . là x nhé 

dấu nhân.

a: 18:(x-3)=6

=>x-3=18:6=3

=>x=3+3=6

b: \(3^{x-1}+4=85\)

=>\(3^{x-1}=81\)

=>\(3^{x-1}=3^4\)

=>x-1=4

=>x=5

c: 2x+3x=55

=>5x=55

=>x=55/5=11

d: \(\left(x-3\right)^3+11=53\)

=>\(\left(x-3\right)^3=53-11=42\)

=>\(x-3=\sqrt[3]{42}\)

=>\(x=\sqrt[3]{42}+3\)

a) 18 : (x - 3) = 6

x - 3 = 18 : 6

x - 3 = 3

x = 3 + 3

x = 6

b) 3ˣ⁻¹ + 4 = 85

3ˣ⁻¹ = 85 - 4

3ˣ⁻¹ = 81

3ˣ⁻¹ = 3⁴

x - 1 = 4

x = 4 + 1

x = 5

c) 2x + 3x = 55

5x = 55

x = 55 : 5

x = 11

d) Sửa đề:

(x - 3)³ - 11 = 53

(x - 3)³ = 53 + 11

(x - 3)³ = 64

(x - 3)³ = 4³

x - 3 = 4

x = 4 + 3

x = 7

2, 

a) \(315-\left(135-x\right)=215\)

\(\Rightarrow135-x=315-215\)

\(\Rightarrow135-x=100\)

\(\Rightarrow x=135-100\)

\(\Rightarrow x=35\)

b) \(x-320:32=25\cdot16\)

\(\Rightarrow x-10=5^2\cdot4^2\)

\(\Rightarrow x-10=20^2\)

\(\Rightarrow x-10=400\)

\(\Rightarrow x=410\)

c) \(3\cdot x-2018:2=23\)

\(=3\cdot x-1009=23\)

\(\Rightarrow3\cdot x=1032\)

\(\Rightarrow x=1032:3\)

\(\Rightarrow x=344\)

d) \(280-9\cdot x-x=80\)

\(\Rightarrow280-x\cdot\left(9+1\right)=80\)

\(\Rightarrow280-10\cdot x=80\)

\(\Rightarrow10\cdot x=280-80\)

\(\Rightarrow10\cdot x=200\)

\(\Rightarrow x=20\)

e) \(38\cdot x-12\cdot x-x\cdot16=40\)

\(\Rightarrow x\cdot\left(38-12-16\right)=40\)

\(\Rightarrow x\cdot10=40\)

\(\Rightarrow x=40:10\)

\(\Rightarrow x=4\)

bài 1 cậu ko giải giúp mình dc à

Bài 6:

a)\(\left(-18\right)-\left(-3\right)-12\)

\(=\left(-18\right)+3-12\)

\(=-15-12\)

\(=-27\)

b)\(85.\left(35-27\right)-35.\left(85-27\right)\)

\(=85.35-85.27-35.85+35.27\)

\(=85.\left(35-27-35\right)+35.27\)

\(=85.\left(-27\right)+35.27\)

\(=27.\left(-85+35\right)\)

\(=27.\left(-50\right)\)

\(=-1350\)

c)\(\left(-45\right).69+31.\left(-45\right)\)

\(=\left(-45\right).\left(69+31\right)\)

\(=\left(-45\right).100\)

\(=-4500\)

Bài 7:

a)\(\left(2-x\right)+10=-14\)

\(\Rightarrow2-x=-24\)

\(\Rightarrow x=26\)

b)\(14.\left|x\right|=28\)

\(\Rightarrow\left|x\right|=2\)

\(\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)

c)\(31-\left(17+x\right)=55\)

\(\Rightarrow17+x=-24\)

\(\Rightarrow x=-41\)

(-18)-(-3)-12=-27

85.(35-27)-35.(85-27)=-1350

(-45).69+31.(-45)=-4500

(2-x)+10=-14

\(\Leftrightarrow\)(2-x)=-14-10

\(\Leftrightarrow\)2-x=-24

\(\Rightarrow\)x=2-(-24)

\(\Rightarrow\)x=26

14.lxl=28

\(\Leftrightarrow\)lxl=28:14

\(\Leftrightarrow\)lxl=2

\(\Rightarrow\)x=-2

a)42.3-x=78

126-x=78

x=48

b)34.4+x=215

136+x=215

x=79

c)x.6=21

x=3,5

d)x:4=48

x=192

42x3-x=78

126-x=78

      x=126-78

      x=48

nhớ chọn cho mình

a) 42 * 3 - x = 78

     126 - x = 78

        x = 126 - 78

         x = 48

b) 34 * 4 + x = 215

       136 + x = 215

               x = 215 - 136

               x = 79

c) x * 6 = 18 + 3

    x * 6 = 21

      x = 21 : 6

        x = 3,5

d) x/4 = 8 * 6

    x/4 = 48

     x = 48 * 4

     x = 192