\(78-\left(x-25\right).3\frac{1}{3}=73\)

\(78-\left(x-25\right)\cdot\frac{10}{3}=73\)

\(\left(x-25\right)\cdot\frac{10}{3}=78-73\)

\(\left(x-25\right)\cdot\frac{10}{3}=5\)

\(x-25=5:\frac{10}{3}\)

\(x-25=1,5\)

\(x=25+1,5=26,5\)

19x64+76x34

=(19x4)x16+76x34

=76x(16+34)

=76x50

=3800

a) 19 x 64 + 76 x 34

= 19 x 64 + 19 x 4 x 34

= 19 x ( 64 + 4 x 34 )

= 19 x 200

= 3800

k cho mình rùi mình giải bài b) cho

   136 x 68 + 16 x 272

= 136 x 68 + 16 x  2 x 136

= 136 x 68 + 32 x 136

= 136 x ( 68 + 32 )

= 136 x 100

= 13600    

136x68+16x272

=9248 + 4352

=13600

tk cho mik nha

\(\frac{3}{4.7}=\frac{1}{4}-\frac{1}{7}\); \(\frac{1}{7.8}=\frac{1}{7}-\frac{1}{8}\); \(\frac{5}{8.13}=\frac{1}{8}-\frac{1}{13}\); \(\frac{2}{13.15}=\frac{1}{13}-\frac{1}{15}\); \(\frac{9}{15.24}=\frac{1}{15}-\frac{1}{24}\)

nên ta được tổng trên là : \(\frac{1}{4}-\frac{1}{7}\)\(+\frac{1}{7}-\frac{1}{8}\)\(+\frac{1}{8}-\frac{1}{13}\)\(+\frac{1}{13}-\frac{1}{15}\)\(+\frac{1}{15}-\frac{1}{24}\)= \(\frac{1}{4}-\frac{1}{24}\)= 5/24

Nấu bạn k cho mình lên 3 điểm hỏi đáp thì mình sẽ giúp

cảm ơn bạn nha

a) 35 x 34 + 35 x 38 + 65 x 75 + 65 x 45

  = 35 x (34+38)  + 65 x (75 + 45)

  = 35 x 72   +    65 x 120

  =  2520 + 7800 = 10320

b)  3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12

 = 3 x ( 25 x 8) + 4 x (37 x 6) + 2 x (38 x 12)

 = 3 x 200 + 4 x 222 + 2 x 456

= 600 + 888 + 912 = 2400

tk nha

35 x 34 + 35 x 38 + 65 x 75 + 65 x 45 

= 35 x ( 34 + 38 ) + 65 x ( 45 + 75 )

= 35 x 72 + 65 x 120

Vì quy tắc thực hiện tính toán phải làm nhân chia trước nên :

= (35 x 34)+(35 x 38)+(65 x 75)+(65 x 45)

= (1190 + 1330) + (4875 + 2925)

= 2520 + 7800

=10320

b) (3 x 25 x 8) +( 4 x 37 x  6) + (2 x 38 x 12)

= 600 + 888 + 912

= 2400

7 - ( 11 + x - 13 ) : 2 ??? 2/3 = 2 

7 - ( 11 + x - 13 ) : 2  2/3 = 2

đề sai à

=31.22554945

mình chịu

mk cung co bai giong ban , neu ban giai duoc roi thi nhan tin va chi mk nha

7 - ( 11 + x - 13) = 2 x 2/2/3 ( 2/2/3 là hỗn số)

7 - ( 11 + x - 13) = 16/3

     ( 11 + x - 13) = 7 - 16/3

      11 + x - 13  = 5/3 

      11 + x        = 5/3 + 13

      11 + x        =  44/3

       x               = 44/3 - 11

        x              = 11/3

Ban lam mik tuong la 2 . 2/3

\(7-\left(11+x-13\right):2\frac{2}{3}=2\)

\(\Leftrightarrow\left(11+x-13\right):2\frac{2}{3}=5\)

\(\Leftrightarrow\left(x-2\right):\frac{8}{3}=5\)

\(\Leftrightarrow x-2=5\cdot\frac{8}{3}\)

\(\Leftrightarrow x-2=\frac{40}{3}\)

\(\Leftrightarrow x=\frac{46}{3}\)

mình làm đúng ko các bạn?

\(7-\left(11+x-13\right)\div2\frac{2}{3}=2\)

\(\left(11+x-13\right)\div2\frac{2}{3}=7-2\)

\(\left(11+x-13\right)\div2\frac{2}{3}=5\)

\(11+x-13=\frac{40}{3}\)

\(11+x=\frac{79}{3}\)

\(x=\frac{46}{3}\)

Ta có:

\(7-\left(11+x-13\right)\div2\frac{2}{3}=2\)

\(7-\left(11+x-13\right)=2.2\frac{2}{3}\)

\(7-\left(11+x-13\right)=\frac{16}{3}\)

\(11+x-13=7-\frac{16}{3}\)

\(11+x-13=\frac{5}{3}\)

\(11+x=\frac{5}{3}+13\)

\(11+x=\frac{44}{3}\)

\(x=\frac{44}{3}-11\)

\(x=\frac{11}{3}\)

43/3 mình ko chắc nhé :)

(11+x-13):\(2\frac{2}{3}\)=7-2

(11+x-3):\(\frac{8}{3}\)=5

11+x-3 =5 * \(\frac{8}{3}\)

11+x-3=\(\frac{40}{3}\)

x-3=\(\frac{40}{3}\) -11=\(\frac{40}{3}\) -\(\frac{33}{3}\)

x-3=\(\frac{7}{3}\)

x=\(\frac{7}{3}\) +3=\(\frac{7}{3}\)+\(\frac{9}{3}\)

x=\(\frac{16}{3}\)=\(5\frac{1}{3}\)

7 - ( 11 + x - 13 ) = 2 x \(\frac{8}{3}\)

7 - ( 11 + x - 13 ) = \(\frac{16}{3}\)

11 + x - 13 = 7 - \(\frac{16}{3}\)

11 + x - 13 = \(1\frac{2}{3}\)

11 + x = \(1\frac{2}{3}\)+ 13 

11 + x = \(14\frac{2}{3}\)

x = \(14\frac{2}{3}-11\)

x = \(3\frac{2}{3}\)

Vậy x = \(\frac{11}{3}nha\)!!!

11/3 nha