Tìm x biết
a) (8/7-5/3).7/2x+6/5.15/7=2/7x
b)(4/3-25%-5/12)-3x=1,6:3/5
c)1/2(4x-6)-1=2(1/2x+3)
d)x ²+8/9=41/36
e) (x-3) ²+ -9/25=2/5.8/5
f) 3/11.22/6-(x+1) ²=7/16
g)1+(x+1) ³=31/64
h)(x-1/2) ²-9/16=1
i)3-x/5-x=(-3/5) ²
Tìm x biết
a) (8/7-5/3).7/2x+6/5.15/7=2/7x
b)(4/3-25%-5/12)-3x=1,6:3/5
c)1/2(4x-6)-1=2(1/2x+3)
d)x ²+8/9=41/36
e) (x-3) ²+ -9/25=2/5.8/5
f) 3/11.22/6-(x+1) ²=7/16
g)1+(x+1) ³=31/64
h)(x-1/2) ²-9/16=1
i)3-x/5-x=(-3/5) ²
Đáp án:
a = 252/445
b = 7/54
c = 2
d = 1/2
e = 4
f = -1/4
g = ?
h= 7/4
i =
Giải thích các bước giải:
a) (8/7-5/3).7/2x+6/5.15/7=2/7x
-11/21 . 7/2x + 6/5 = 2/7x
-11/6x + 6/5 = 2/7x
-11/6x – 2/7x = -6/5
(-11/6 – 2/7)x = -6/5
-89/42x = -6/5
x = 252/445
b)(4/3-25%-5/12)-3x=1,6:3/5
2/3 – 3x = 5/18
3x = 7/18
x = 7/54
c)1/2(4x-6)-1=2(1/2x+3)
2x – 3 – 1 = x +6
2x -4 = x+6
2x -x+6 = 4
x + 6 = 4
x = 2
d)x ²+8/9=41/36
x^2 = 1/4
x^2 = (1/2)^2
⇒ x = 1/2
e) (x-3) ²+ -9/25=2/5.8/5
(x-3) ² -9/25 = 16/25
(x-3) ² = 1
x-3 = 1
x = 4
f) 3/11.22/6-(x+1) ²=7/16
1 – (x+1 )^2 = 7/16
(x+1)^2 = 9/16
(x+1)^2 = (3/4)^2
x+1 = 3/4
x = -1/4
g)1+(x+1) ³=31/64
h)(x-1/2) ²-9/16=1
(x-1/2)^2 = 25/16
(x-1/2)^2 = (5/4)2
x-1/2 = 5/4
x = 7/4
i)3-x/5-x=(-3/5) ²
-x/5 = -2.64
-x/5- (5x/5) = -2.64
(-x-5x)/5= -2.64
4x/5 = -2.64
4x = -13.2
x = -3.3
(câu g thì mình chưa làm được, bạn thử xem lại đi)
Đáp án:
Giải thích các bước giải:
a)
($\frac{8}{7}$ – $\frac{3}{5}$) . $\frac{7}{2}$x + $\frac{6}{5}$ . $\frac{15}{7}$ = $\frac{2}{7}$x
$\frac{19}{35}$ . $\frac{7}{2}$x + $\frac{18}{7}$ = $\frac{2}{7}$x
$\frac{19}{10}$x + $\frac{18}{7}$ = $\frac{2}{7}$x
$\frac{19}{10}$x – $\frac{2}{7}$x = $\frac{18}{7}$
$\frac{113}{70}$x = $\frac{18}{7}$
x = $\frac{18}{7} : $\frac{113}{70}$
x = $\frac{180}{113}$
Vậy x = $\frac{180}{113}$