a) (4600 + 6400) -7.x=3839
11000 - 7.x=3839
7.x=11000-3839
7.x=7161
x=7161:7
x=1023
b) (8x-14) :2-2= 341:31
(8x-14):2-2=11
(8x-14):2= 11+2
(8x-14):2=13
8x-14=13.2
8x-14=26
8x=26+14
8x=40
x=40:8
x=5
a) \(\left(4600+6400\right)-7x=3839\Rightarrow11000-7x=3839\)
\(\Rightarrow-7x=3839-11000\)
\(\Rightarrow7x=7161\Rightarrow x=1023\)
a)11000-7x = 3839
<=> -7x = -7161
<=> x = 1023
b)
(4x--9)*31=341
121x-279=341
121x=620
x=5,12
c)
2x-6-x=32
x-6=32
x=38 nhớ k nhá
a, (4600 + 6400) - 7x = 3839
11000 - 7x = 3839
11000 - 3839 = 7x
7161 = 7x
x = 7161 : 7
x = 1023
b, [(8x - 14) : 2 - 2] . 31 = 341
[(8x - 14) : 2 - 2] = 341 : 31
[(8x - 14) : 2 - 2] = 11
(8x - 14) : 2 = 11 + 2
(8x - 14) : 2 = 13
8x - 14 = 13 x 2
8x - 14 = 26
8x = 26 + 14
8x = 40
x = 40 : 8 = 5
c, 2 . (x - 3) - x = 4.23
2 . (x - 3) - x = 32
x - 3 - x = 32 : 2
x - 3 - x = 16
Đến đây thì không biết
a) \(\left(4600+6400\right)-7x=3839\)
\(\Leftrightarrow11000-7x=3839\)
\(\Leftrightarrow7x=11000-3839\)
\(\Leftrightarrow7x=7161\)
\(\Leftrightarrow x=1023\)
b) \(\left[\left(8x-14\right):2-2\right]\cdot31=341\)
\(\Leftrightarrow\left[\left(8x-14\right):2-2\right]=341:31\)
\(\Leftrightarrow\left(8x-14\right):2-2=11\)
\(\Leftrightarrow\left(8x-14\right):2=13\)
\(\Leftrightarrow8x-14=26\)
\(\Leftrightarrow8x=40\)
\(\Leftrightarrow x=5\)
c) \(2\left(x-3\right)-x=4\cdot2^3\)
\(\Leftrightarrow2x-6-x=32\)
\(\Leftrightarrow2x-x=32+6\)
\(\Leftrightarrow x=38\)
(4600+6400)-7*x=3839
11000-7*x=3839
7*x=11000-3839
7*x=7161
x=7161/7
x=123
vay=123