Ta có : 0,36⋅950+0,18⋅726⋅2+3⋅324⋅0,121+3+5+7+9+...+27+29+31−1521+3+5+7+9+...+27+29+31−1520,36⋅950+0,18⋅726⋅2+3⋅324⋅0,12​

Đặt A = 0,36 . 950 + 0,18 . 726 . 2 + 3. 324 . 0,12

          = 0,36 . 950 + 0,36 . 726 + 0,36 . 324

          = 0,36(950 + 726 + 324) = 0,36.2000 = 720

Đặt B = (1 + 3 + 5 + 7 + 9 + ... + 27 + 29 + 31) - 152

Số số hạng : (31 - 1) : 2 + 1 = 16(số)

=> Tổng : (1 + 31).16 : 2 = 256

=> B = 256 - 152 = 104

Vậy ��=720104=9013BA​=104720​=1390​
 

Lời giải:
1. Bạn coi lại đề

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$

1. ...............................

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$

Ggqgqgqgqggqgqg

a) \(234+\left(345-x\right)=500\)

\(345-x=500-234\)

\(345-x=266\)

\(x=79\)

vay \(x=79\)

b) \(456-\left(x+23\right)=326\)

\(x+23=456-326\)

\(x+23=130\)

\(x=107\)

vay \(x=107\)

c) \(\left(5x-15\right):5=0\)

\(5x-15=0\)

\(5x=15\)

\(x=3\)

vay \(x=3\)

d) \(84-4\left(2x+1\right)=48\)

\(8x+4=84-48\)

\(8x+4=36\)

\(8x=32\)

\(x=4\)

vay \(x=4\)

e) \(\left(x-76\right).54=0\)

\(x-76=0\)

\(x=76\)

vay \(x=76\)

f) \(\left(x-3\right)\left(x+4\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)

vay \(\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)

g) \(\left(x-6\right)\left(x-7\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}\)

vay \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)

h) \(\left(x-2\right)\left(x-3\right)\left(x-5\right)=0\)

\(\Rightarrow x-2=0\Rightarrow x=2\)hoac  \(\orbr{\begin{cases}x-3=0\\x-5=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=5\end{cases}}\)

vay \(x=2\)hoac \(\orbr{\begin{cases}x=3\\x=5\end{cases}}\)

những bài này dễ mà bn

câu a,b thì chắc bn biết

c)(5.x-15):5=0

   (5.x-15)   =0.5

   (5.x-15)   =0

    5.x         =0+15

    5.x         =15

       x         =15:5

       x         =3

d)84-4.(2.x+1)=48

         4.(2.x+1)=84-48

         4.(2.x+1)=36

             2.x+1 =36:4

             2.x+1 =9

             2.x     =9-1

             2.x     =8

                x     =8:2

                x     =4

e)(x-76).54=0

     x-76      =0:54

     x-76      =0

     x           =0+76

     x          =76

f) (x-3).(x+4)=0

\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)

Vậy x=3 hoặc x=-4

câu g,h làm tương tự

băng 0 bn nhá

=(1+2+...+100)*(1125-1125)*(234*12+234*88)

=(1+2+...+100)*0*(234*12+234*88)

=0

Xin lỗi nhé , Yami

a) 234 x 95 + 234 x 4 + 234 = 234 x ( 95 + 4 + 1 ) = 234 x 100 = 23400

a).234 x 95 + 234 x 4 + 234 

= 234 x ( 95 + 4 + 1 ) 

= 234 x 100

= 23400

b)  ( 1+1/2) x ( 1+1/3) x ( 1+1/4 )

= ( 2/2+1/2 ) x ( 3/3+1/3 ) x ( 4/4 + 1/4)

=3/2 + 4/3 + 5/4

= 18/12 + 16/12 + 20/12

= 54/12

= 9 /2

b) ( 1 + \(\frac{1}{2}\)) x ( 1 + \(\frac{1}{3}\) ) x ( 1 + \(\frac{1}{4}\) ) = \(\frac{3}{2}\) x \(\frac{4}{3}\) x \(\frac{5}{4}\) = \(\frac{5}{2}\)

a,234.4+234.5+234=234(4+5+1)=234.10=2340

b,135.16-135.2-135.4=135(16-4-2)=135.10=1350

c,1/2+1/4+1/8+1/16+1/32+1/64=1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32=1-1/32=31/32

a) 234 x4 + 234 x 5 + 234 = 234 x ( 1+4+5)=2340

b)135 x16 -135 x2 -4 x135 =135 x (16-2-4) =1350

a) 234.(4+5+1)=234.10=2340

b)135.(16-2-4)=135.10=1350

D

x/234=5/9

x:234=5/9

x=5/9x234

x=130

x= 130

x=130.

tk mk di