8x =7,8x + 25

<=> 8x - 7,8x=25

<=> 0,2x=25

<=> x=25/0.2

<=> x=125

x = 125

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8x=7,8x+25

8x-7,8x=25

x (8-7,8)=25

x.0,2=25

x=25:0,2

x=125

Trừ cả hai vế đi 7,8x

25 = 0,2x

x = 25 : 0,2

x = 125

8x = 7,8x + 25

=> 8x - 7,8x = 25

=> 0,2x = 25

=> x = 25 : 0,2

=> x = 125

8x = 7,8x + 25

=> 8x - 7,8x = 25

=> 0,2x = 25

=> x = 25 : 0,2

=> x = 125

Vậy X = **125**

7,8.x+25=8x

7,8x-8x=-25

x.(7,8-8)=-25

x.(-0,2)=-25

x=-25:(-0,2)

x=125

Vậy x=125

Học tốt

8x = 7,8x+25

8x - 7,8x = 25

0,2x = 25

x = 25/0,2

x = 125

=.= hk tốt!!

8x=7,8x+25

8x - 7,8x=25

0,2x=25

x=25/0,2

x=125

1/2 - (2/3x - 1/3) = 2/3

=> 1/2 - 2/3x + 1/3 = 2/3

=> 5/6 - 2/3x = 2/3

=> 2/3x = 5/6 - 2/3

=> 2/3x = 1/6

=> x = 1/6 : 2/3

=> x = 1/4

8x = 7,8x + 25

=> 8x - 7,8x = 25

=> 0,2x = 25

=> x = 25 : 0,2

=> x = 125

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

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

\(-\frac{2}{3}x=-\frac{1}{6}\)

\(x=\frac{1}{4}\)

\(8x=7,8x+25\)

\(02,x=25\)

\(x=125\)

=.= hk tốt!!

giải giúp mk vs mấy bn ưi !!!

\(8x=7,8x+25\)

\(\Leftrightarrow8x-7,8x=25\)

\(\Leftrightarrow0,2x=25\)

\(\Leftrightarrow x=125\)

\(x=125\)

0.2x=25

x=125

8x=7,8x+25

8x-7,8x=25

0,2x=25

1/5x=25

x=25:1/5

x=25.5

x=125

là 125

8x- 7,8x = 25

x . 0,2 = 25

x = 25: 0,2

x=125

8x + 2x = 25 . 4

x . ( 8 + 2 ) = 100

x . 10 = 100

x = 100 : 10

x = 10

6x = 5^{21 - 19} + 3 . 4 - 1

6x = 5² + 12 - 1

6x = 25 + 11

6x = 36

x = 36 : 6

x = 6

X-1/4.x=6/11.(6/12+9/12+-4/12)

X-1/4.x=6/11.11/12

X-1/4.x=1/2

X.(1-1/4)=1/2

X.(4/4+-1/4)=1/2

X.3/4=1/2

X=1/2:3/4

X=1/2.4/3

X=2/3

Giai thich trong mot bai toan neu co hai dau x ta se ko tinh duoc trong bai toan nay x-25℅.x=6/11.(1/2+3/4+1/3) co hai dau x nen ta phai dua x ra ngoai lam h chung x dung mot minh se la x.1 khi ta bo x ra ngoai thi ben trong con 1-25℅ roi ta tinh ra sau do lam binh thuong

8x       =7,8x+25

8x-7,8x=25

0,2x    =25

1/5x    =25

x        =25:1/5

x         =125

8x=7,8x+5.                                                                    <=>8x-7,8=25.                                                         <=>0,2x=25.                                                                        <=>x=25:0,2.                                                           <=>x=125.                                                               Chuc bn hoc tot nha!