\(14\times x+x\times26=25\\ \Rightarrow x\times\left(14+26\right)=25\\ \Rightarrow x\times40=25\\ \Rightarrow x=25:40\\ \Rightarrow x=\dfrac{5}{8}\)

Vậy \(x=\dfrac{5}{8}\)

cứu mik đi mà :(

14*x+x*26= 25

x*\(\left(14+26\right)\)= 25

x*40= 25

x= 25/40

x= 0,625

a) 3+x=-8

x=-8+3

x=-5

b: =>25-x=29

hay x=-4

a) 3 + x = -8                b) (25 - x) - 12 = 27                       c) 2^x + 15 = 31

          x = -8 - 3                25 - x          = 27 + 12                   2^x         = 31 - 15 

          x = -11                   25 - x          = 39                            2^x         = 16

Vậy x = -11                             x          = 25 - 39                     2^x         = 2⁴

                                               x           = - 14                      => x = 4

                                          Vậy x = -14                               Vậy x = 4

Câu hỏi của Nguyễn Bảo Ngân - Toán lớp 4 - Học toán với OnlineMath

Bạn tham khảo.

14x X + X x 26 = 25

X x ( 14 +26 ) = 25

X x 40=25

X = 25 : 40

x = 0,625

#Gà

\(14x+26x=25\)

\(\Leftrightarrow x\left(14+26\right)=25\)

\(\Leftrightarrow40x=25\)

\(\Leftrightarrow x=\frac{25}{40}\)

\(\Leftrightarrow x=\frac{5}{8}\)

\(14x+26x=25\)

\(\Rightarrow40x=25\)

\(\Rightarrow x=\frac{25}{40}\)

\(\Rightarrow\frac{5}{8}\)

X x (14+26) = 25

X x 40 = 25

X = 25 : 40

X = 25/40 hoac 0.625

a)

\(\left(x-\dfrac{2}{3}\right):\dfrac{1}{2}=\dfrac{5}{7}\)

\(\Rightarrow x-\dfrac{2}{3}=\dfrac{5}{7}\) x \(\dfrac{1}{2}\)

\(\Rightarrow x-\dfrac{2}{3}=\dfrac{5}{14}\)

\(\Rightarrow x=\dfrac{5}{14}+\dfrac{2}{3}\)

\(\Rightarrow x=\dfrac{15}{42}+\dfrac{2}{42}\)

\(\Rightarrow x=\dfrac{17}{42}\)

b)

\(x\) x \(\dfrac{1}{2}=1-\dfrac{1}{3}\)

\(x\) x \(\dfrac{1}{2}=\dfrac{3}{3}-\dfrac{1}{3}\)

\(x\) x \(\dfrac{1}{2}=\dfrac{2}{3}\)

\(\Rightarrow x=\dfrac{2}{3}:\dfrac{1}{2}\)

\(\Rightarrow x=\dfrac{2}{3}\) x \(2=\dfrac{4}{3}\)

c)

\(\dfrac{26}{5}-x=\dfrac{9}{15}\) x \(\dfrac{25}{3}\)

\(\dfrac{26}{5}-x=5\)

\(\Rightarrow x=\dfrac{26}{5}-5\)

\(\Rightarrow x=\dfrac{26}{5}-\dfrac{25}{5}\)

\(\Rightarrow x=\dfrac{1}{5}\)

khó quá ??????????????????????????????????

a) (-2) . ( x+7 ) + (-5) = 7 

<=>(-2).(x+7)=7+5

<=>x+7=12:(-2)

<=>x+7=-6

<=>x=(-6)-7

<=>x=-13

Vậy x=-13

b)(x+4) : (-7) = 14

<=>x+4=14 x (-7)

<=>x+4=-98

<=>x=-98-4

<=>x=-102

Vậy x= -102

c) 72 : ( x+5) - 4 = -12 

<=>72:(x+5)=(-12)+4

<=>x+5=72:(-8)

<=>x+5=-9

<=>x=-9-5

<=>x=-14

Vậy x= -14

d) (x+3) : (-6 ) + 12 = 8 

<=>(x+3) :(-6)=8-12

<=>x+3=(-4)x(-6)

<=>x+3=24

<=>x=24-3

<=>x=21

Vậy x= 21 

\(\Leftrightarrow14-\frac{72}{-\left(8+x\right)}=-23\)

\(\Leftrightarrow37+\frac{72}{8+x}=0\)

\(\Leftrightarrow37\left(8+x\right)+72=0\)

\(\Leftrightarrow296+37x+72=0\)

\(\Leftrightarrow37x=-368\Leftrightarrow x=-\frac{368}{37}\)