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(13 - x) x 28 = 28
13 - x = 28 : 28
13 - x = 1
x = 13 - 1
x = 12
( 13 - x ) . 28 = 28
<=> 13 - x = 28 : 28
<=> x = 13 - 1
<=> x = 12
^^ Học tốt nhá!!!
\(2x+3=15\\ \Rightarrow2x=15-3=12\\ \Rightarrow x=\dfrac{12}{2}=6\\ ---\\ 28-3x=13\\ \Rightarrow3x=28-13=15\\ \Rightarrow x=\dfrac{15}{3}=5\\ ---\\ \left(x-1954\right).5=50\\ \Rightarrow x-1954=50:5=10\\ \Rightarrow x=10+1954=1964\\ ---\\ x-152:2=46\\ \Rightarrow x-76=46\\ \Rightarrow x=46+76=122\)
a, 2\(x\) + 3 = 15
2\(x\) = 12
\(x\) = 6
b, 28 - 3\(x\) = 13
3\(x\) = 28 - 13
3\(x\) = 15
\(x\) = 5
a: =>3(x+4)=115
=>x+4=115/3
hay x=103/3
b: =>\(8^3\cdot\left(12x-64\right)=4\cdot8^4\)
\(\Leftrightarrow12x-64=32\)
=>12x=96
hay x=8
c: \(\Leftrightarrow\left(4x+28\right)\cdot23+55=175\)
=>(4x+28)x23=120
=>4x+28=120/23
=>4x=-524/23
hay x=-131/23
a) x - 12 = 14 x = 14 + 12 x = 26
b) 2 x - 13 = 3 . 17 2 x = 51 + 13 2 x = 64 x = 64 : 2 x = 32
c) x - 43 = 2 . 18 x = 36 + 43 x = 79
d) x - 14 . 39 = 0 x - 14 = 0 x = 14
e) 13 - x . 28 = 28 13 - x = 28 : 28 13 - x = 1 x = 13 - 1 x = 12
f) 22 . 35 - x = 22 35 - x = 1 x = 35 - 1 x = 34
g) x - 24 : 2 = 18 x - 12 = 18 x = 39
h) 400 + 275 - x = 570 275 - x = 570 - 400 275 - x = 170 x = 275 - 170 x = 105
\(\frac{1}{13}-\left(\frac{5}{42}-x\right)=-\left(-\frac{113}{364}\right)\)
=>\(\frac{1}{13}-\frac{5}{42}+x=\frac{113}{364}\)
=>\(-\frac{23}{546}+x=\frac{113}{364}\)
=>\(x=\frac{113}{364}-\left(-\frac{23}{546}\right)\)
=>\(x=\frac{113}{364}+\frac{23}{546}\)
=>\(x=\frac{55}{156}\)
a) x – 12 = 14
x = 14 +12
x = 26
b) 2x – 13 = 3.17
2x = 51 + 13
2x = 64
x = 64 : 2
x = 32
c) x – 43 = 2.18
x = 36 +43
x = 79
d) (x – 14).39 = 0
x – 14 = 0
x = 14
e) (13 – x).28 = 28
13 – x = 1
13 – x = 1
x = 13 – 1
x = 12
f) 22.(35 – x) = 22
35 – x = 1
x = 35 – 1
x = 34
g) x – 24 : 2 = 18
x – 12 = 18
x = 39
h) 400 + (275 – x) = 570
275 – x = 570 – 400
275 – x = 170
x = 275 – 170
x = 105
a) x - 12= 91
x= 91 + 12
x= 103
b) 42 - x= 2 . 18
42 - x= 36
x = 42 - 36
x = 6
c) (13 - x ) .28 =28
13 - x= 28 : 28 =1
x= 13 - 1
x= 12
a, x - 12 = 7 . 13
x - 12 = 91
x = 91 + 12
x = 103
b, 43 - x = 2.18
43 - x = 36
x = 43 - 36
x = 6
c, ( 13 - x ). 28 = 28
13 - x = 28 ÷ 28
13 -x = 1
x = 13 - 1
x = 12
\(28-3.x=13\)
\(3.x=28-13\)
\(3.x=15\)
\(x=5\)
\(28-3.x=13\)
\(3.x=28-13\)
\(3.x=15\)
\(x=15\div3\)
\(x=5\)