2144

= 32 x (67 + 2 - 2 )  = 32 x 67 = 2144

32 x 67 + 32 x 2 - 32 x 2 

= 32 x (67+2-2)

=32 x 67

=2144

a) 32 : 4 : 2 = 8 : 2 = 4 

     32 : 4 : 2 = 32 : 2 = 16 

b) 18 : 2 x 3 = 18 : 6 = 3

     18 : 2 x 3 = 9 x 3 = 18

                                             Bài giải

a, \(81+243+19=\left(81+19\right)+243=100+243=343\)

b, \(2\text{ x }25\text{ x }2\text{ x }16\text{ x }4=25\text{ x }4\text{ x }2\text{ x }2\text{ x }16=25\text{ x }8\text{ x }32=200\text{ x }32=6400\)

c, \(32\text{ x }47+32\text{ x }54-32=32\text{ x }\left(47+54-1\right)=32\text{ x }100=3200\)

a,81+19+243

=100+243

b,(2x25)x2x(16x4)

=50x2x64

=100x64

=6400

c,32x47+32x54-32x1

=32x(47+54-1)

=32x100

=3200

a,\(81+243+19=\left(81+19\right)+243\)

                                \(=100+243=343\)

b,\(2\times25\times2\times16\times4=\left(25\times4\right)\times\left(2\times2\times16\right)\)

                                          \(=100\times64=6400\)

c,\(32\times47+32\times54-32=32\times47+32\times54-32\)

                                                  \(=\left(47+54-1\right)\times32\)

                                                  \(=3200\)

32 . ( 2 . x9) = 32

         2 . x9 = 32 : 32

          2 . x9 = 1

                x9 = 1:2

                  x9= 1/2

                  x  = 1/2 : 9

                  x=     1/18

dấu chấm là nhân nha

l-ike đi

x/32=2/x

=xx=32.2

=2x=64

x=64:2

x=32

chúc bạn học tốt

\(\frac{x}{32}=\frac{2}{x}\)

NHÂN CHÉO CHO NHAU TA CÓ:

\(x.x=32.2\)

\(\Leftrightarrow x^2=64\)

\(\Leftrightarrow x^2=8^2\)

\(\Leftrightarrow x=8\)

BẠN KIA LÀM SAI RỒI X.X MÀ BẰNG 2X CÓ PHẢI X+X ĐÂU

ờ nhở mk nhầm h ms nhận ra

sorry bn

\(A=\dfrac{1}{3}+\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{99}}\)

\(\Rightarrow\dfrac{A}{3}=\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{100}}\)

\(\Rightarrow A-\dfrac{A}{3}=\dfrac{2A}{3}=\left(\dfrac{1}{3}+\dfrac{1}{3^2}+\dfrac{1}{3^3}+...+\dfrac{1}{3^{99}}\right)-\left(\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{100}}\right)\)

\(\Rightarrow\dfrac{2A}{3}=\left(\dfrac{1}{3^2}-\dfrac{1}{3^2}\right)+\left(\dfrac{1}{3^3}-\dfrac{1}{3^3}\right)+...+\left(\dfrac{1}{3^{99}}-\dfrac{1}{3^{99}}\right)+\left(\dfrac{1}{3}-\dfrac{1}{3^{100}}\right)=\dfrac{1}{3}-\dfrac{1}{3^{100}}\)

\(\Rightarrow2A=3\cdot\left(\dfrac{1}{3}-\dfrac{1}{3^{100}}\right)\)

\(\Rightarrow\text{A}=\dfrac{1-\dfrac{1}{3^{99}}}{2}\)

\(\Rightarrow A=\dfrac{1}{2}-\dfrac{1}{2.3^{99}}< \dfrac{1}{2}\)

a) 27 x (-17) + 17 x 127

= 27 x (-17) - 17 x (-127)

= -17 x (27-127)

= -17 x -100 = 1700

b) 2 x (1 +32) - 2 x 32

= 2 x (1 + 32 - 32)

= 2 x 1 = 2

\(\text{2 x ( 1 + 32 ) -2 x 32}\)

\(=2.33-2.32\)

\(=2.\left(33-32\right)\)

\(=2.1\)

\(=2\)

chúc bạn học tốt

\(32\left(\frac{1}{8.11}+\frac{1}{11.14}+\frac{1}{14.17}+...+\frac{1}{197.200}\right)-x=\frac{1}{2}\)

\(\frac{32}{3}\left(\frac{3}{8.11}+\frac{3}{11.14}+\frac{3}{14.17}+....+\frac{3}{197.200}\right)-x=\frac{1}{2}\)

\(\frac{32}{3}\left(\frac{1}{8}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{17}+...+\frac{1}{197}-\frac{1}{200}\right)-x=\frac{1}{2}\)

\(\frac{32}{3}\left(\frac{1}{8}-\frac{1}{200}\right)-x=\frac{1}{2}\)

x=0.78

a) => (x+32) - 17 = 42:2 = 21

=> x+32 = 21+17 = 38

=> x=38-32=6

b) => 61+(53-x) = 1785:17=105

=> 53-x = 105-61=44

=> x = 53-44 =9

c) => x^2 +54 -32 = 244:2 = 122

=> x^2 +22 = 122

=> x^2 = 122-2=100

=> x= 10 hoặc -10

giải oy pn **** giùm mk nka

a. X = 6

b. X = 9

c. X = 10