\(x+15,7=7,2\times2,5\)
    \(x+15,7=18\) 
    \(x=18-15,7\)   
    \(x=2,3\)
    Vậy \(x=2,3\)


    \(x\times9,1+x\times1,9=26,4\)
⇔\(x\times\left(9,1+1,9\right)=26,4\)
    \(x\times10=26,4\)
    \(x=26,4:10\)
    \(x=2,64\)
    Vậy \(x=2,64\)


    \(x:12,5=48-45,66\)
    \(x:12,5=2,34\)
    \(x=2,34\times12,5\)
    \(x=29,25\)
    Vậy \(x=29,25\)


    Sửa đề:
    \(x\times9,9+x\times10=12,5\)
⇔\(x\times\left(9,9+10\right)=12,5\)
    \(x\times19,9=12,5\)
    \(x=12,5:19,9\)
    \(x=\dfrac{125}{199}\)
    Vậy \(x=\dfrac{125}{199}\)
\(#PeaGea\)

xxxx

[ 61 + ( 53 - x ) ] x 17 = 1785

61 + 53 - x = 1785 : 17

114 - x = 105

x = 114 - 105

x = 9

\(\left[61+\left(53-x\right)\right].17=1785\)

\(\Leftrightarrow61+\left(53-x\right)=105\)

\(\Leftrightarrow53-x=44\Leftrightarrow x=9\)

158,65-63,75:17=158,65-3,75=154,9

65,2:10-67,2x0,1=6,52-6,72=-0,23

xx35=164-83,5

x x35=80,5

x=80,5:35

x=2,3

[7,5x10-650x0,1]xx=8,4

[75-65]x x=8,4

10x x=8,4

x=8,4:10

x=0,84

Bài 1 :

(4/5 + 3/10 - 1/5) x 6 : 4/7

= 9/10 x 6 : 4/7

= 27/5 : 4/7

= 189/20

2007 x 76 - 75 x 2007 - 2007

= 2007 x (76 - 75 - 1)

= 2007 x 0

= 0

(47,5 + 8,6 x 4,5 - 105)

= 47,5 + 38,7 - 105

= 86,2 - 105

= -94/5

Bài 2 :

a) x : 2/3 = 10

           x = 10 x 2/3

           x = 20/3

theo cách đó tự làm

A) X = 5/8 - 1/4 

B) X = 1/10 + 3/5

C) X = 6/11 : 2/7

D) X = 1/4 x 3/2

Còn đâu bạn tự tính nha

Nhớ tích tích đúng cho mình đấy

a)x=5/8-1/4
   x=5/8-2/8
   x=3/8
b)x=1/10+3/5
   x=1/10+3/10
   x=4//10
c)x=2/11:2/7
  x=2/11x7/2
  x=11/7
d)x=1/4x3/2
    x=3/8
đánh giá 5 sao cho mình nhá! cảm ơn nhìu

\(\frac{2}{3}:\frac{x}{5}+\frac{5}{7}=\frac{2}{7}:\frac{3}{5}+\frac{9}{10}\)

\(\frac{2}{3}.\frac{5}{x}=\frac{2}{7}.\frac{5}{3}+\frac{9}{10}-\frac{5}{7}\)

\(\frac{10}{3}:x=\frac{10}{21}+\frac{9}{10}-\frac{5}{7}=\frac{100+189-150}{210}=\frac{139}{210}\)

\(x=\frac{700}{139}\)

x : 5/4 = 9/5 + 1/2

=> x : 5/4 = 23/10

=> x = 23/10 . 5/4

=> x = 23/8

(x + 3/4) . 5/7 = 10/9

=> x + 3/4 = 10/9 : 5/7

=> x + 3/4 = 14/9

=> x = 14/9 - 3/4

=> x = 29/36

\(x:\frac{5}{4}=\frac{9}{5}+\frac{1}{2}\)

\(\Rightarrow x:\frac{5}{4}=\frac{23}{10}\)

\(\Rightarrow x=\frac{23}{8}\)

a) \(x-1\frac{4}{5}=\frac{10}{5}\)

\(\Rightarrow x=2+1\frac{4}{5}=3\frac{4}{5}=\frac{19}{5}\)

b) \(5,85:x=26-25,5\)

\(\Leftrightarrow5,85:x=0,5\)

\(\Rightarrow x=5,85:0,5=11,7\)

c) \(151-\left(-2\right).\left(x-6\right)=2227:17=131\)

\(\Rightarrow\left(-2\right).\left(x-6\right)=151-131=20\)

\(\Rightarrow\left(x-6\right)=20:\left(-2\right)=-10\)

\(\Rightarrow x=-4\)

d) \(\frac{2}{3}-\frac{1}{3}x=\frac{1}{4}\)

\(\Rightarrow \frac{1}{3}x=\frac{2}{3}-\frac{1}{4}=\frac{5}{12}\)

\(\Rightarrow x=\frac{5}{12}:\frac{1}{3}=\frac{5}{4}\)

dấu chấm (.) là dấu nhân nhé

Ban co chac ket qua dung ko