A) x + 1/2=3/4 B) 8x = 7,8x + 25 C) x-25%x = 1/2 E)(X – 7/18) . 18/29 = -12/29 F) (4,5+3/4X) : 8/3 = 9/8 G)(4 1/3 +3X ) . 2 3/5=2/3-5

0 bình luận về “A) x + 1/2=3/4 B) 8x = 7,8x + 25 C) x-25%x = 1/2 E)(X – 7/18) . 18/29 = -12/29 F) (4,5+3/4X) : 8/3 = 9/8 G)(4 1/3 +3X ) . 2 3/5=2/3-5”

1. Đáp án:

    a,x= 3/4-1/2=1/4

   b, 8x-7,8x = 25=> 1/5x = 25=> x= 125

   C,x-1/4=1/2 => x= 3/4

   E,(x-7/18)= -12/29:18/29 =-2/3=>x=-5/18

   F,(4,5+3/4x)=9/8×8/3=3=>3/4x=3-4,5=>x=-3/2:3/4=-2

   G, (41/3+3x)= (2/3-5):23/5=>3+3x=-65/69:41/3=-65/343=>3x=-2894/943=> x= -2894/2829

   Giải thích các bước giải:

    

   Bình luận

2. a,x + $\frac{1}{2}$= $\frac{3}{4}$

   ⇒x = $\frac{3}{4}$ – $\frac{1}{2}$

   ⇒x = $\frac{1}{4}$

   b,8x = 7,8x + 25

   ⇒8x – 7,8x = 25

   ⇒0,2x = 25

   ⇒x = 25 : 0,2

   ⇒x = 125

   c,x – 25%x =$\frac{1}{2}$

   75%x = $\frac{1}{2}$

   ⇒x = $\frac{1}{2}$ : 75% 

   ⇒x = $\frac{2}{3}$

   e,(x – $\frac{7}{18}$) ·$\frac{18}{29}$ = -$\frac{12}{29}$

   ⇒x – $\frac{7}{18}$ = -$\frac{12}{29}$ : $\frac{18}{29}$

   ⇒x – $\frac{7}{18}$ = -$\frac{2}{3}$

   ⇒x = -$\frac{2}{3}$ + $\frac{7}{18}$

   ⇒x = -$\frac{5}{18}$

    

   Bình luận