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(82 - 5.x) : 13 - 4 = 0
(82 - 5.x) : 13 = 0 + 4
(82 - 5.x) : 13 = 4
(82 - 5.x) = 4 . 13
(82 - 5.x) = 52
5.x = 82 - 52
5.x = 30
x = 30 : 5 = 6
(32 . 45) : 2 = (x + 70) : 14 - 40
720 = (x + 70) : 14 - 40
(x + 70) : 14 = 720 + 40
(x + 70) : 14 = 760
(x + 70) = 760 . 14
(x + 70) = 10640
x = 10640 - 70
x = 10570
a)70-5.(x-3)=45
5.(x-3)=70-45
5.(x-3)=25
(x-3)=25:5
(x-3)=5
x =5+3
x =8
\(70-5\times\left(2x-3\right)=45\)
\(\Leftrightarrow5\times\left(2x-3\right)=70-45\)
\(\Leftrightarrow5\times\left(2x-3\right)=25\)
\(\Leftrightarrow2x-3=25:5\)
\(\Leftrightarrow2x-3=5\)
\(\Leftrightarrow2x=5+3\)
\(\Leftrightarrow2x=8\)
\(\Leftrightarrow x=8:2\)
\(\Leftrightarrow x=4\)
Vậy \(x=4\)
mik nhé !!
a) 2 * x - 138 = 8 * 9
2 * x - 138 = 72
2 * x = 210
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - x + 6 = 103
237 - x = 103
x = 134
c) 70 - 5 * ( x-3) = 45
5 * (x-3) = 25
x - 3 = 5
x = 8
cac phan con lai bn lm tuong tu nha
* 2*X-138=8*9
<=> 2*X-138=72
<=> 2*X=72+138
<=> 2*X=210
<=> X=210/2=105
*231-(X-6)=1339:13
<=> 231-(X-6)=103
<=> X-6=231-103
<=>X-6=128
<=>X=128+6=134
*70-5*(X-3)=45
<=>5*(X-3)=70-45
<=>5*(X-3)=25
<=>X-3=25/5
<=>X-3=5
<=>X=8
*10+2*X=16
<=>2*X=16-10
<=>2*X=6
<=>X=6/2=3
a. (45-63+18) x (1+2+3+4+5+6+7+8+9)
= 0 x (1+2+3+4+5+6+7+8+9) = 0
b. 60-61+62-63+64-65+66-67+68-69+70
= 60 + (-61-69)+(62+68)+(-63-67)+(64+66)-65+70
= 60 + (-130)+130+(-130)+130-65-70
= 60 + (-130+130) + (-130+130)-65+70
= 60 - 65 + 70 = 65
70 - 5 x (X - 3) = 45
5 x (X - 3)=70-45
5 x (X - 3)=25
X - 3=25 : 5
X - 3=5
X=5+3
X=8
5 x ( x-3 ) = 70 - 45 = 35
( x-3 ) = 35 : 5 = 6
x = 6 + 3 = 9
X x 3/5+ Xx 3/7=31/70
=>X x (3/5+3/7)=31/70
=>X x 36/35=31/70
=>X=31/70:36/35
=>X=31/72
X x 3/5+ Xx 3/7=31/70
=>X x (3/5+3/7)=31/70
=>X x 36/35=31/70
=>X=31/70:36/35
=>X=31/72
6\(x\): 1y x 70 + 8 - 9 + 123 - 75 x 15 = 17ab
=> 6\(x\) : 1y x 70 + 8 - 9 + 123 -1125 = 17ab
=> 6\(x\) : 1y x 70 = 17ab + 1125 - 123 + 9 - 8 = 17ab + 1003
Sô 17ab + 1003 phải chia hết cho 10 (do vế trái có 70 chia hết cho 10) => b = 7 mà a; b giống nhau nên ab = 77
=> 6\(x\) : 1y x 70 = 1777+ 1003 = 2780 => 6\(x\) : 1y = 2780 : 70 = 278/7 => không có x; y thỏa mãn
\(70-5.\left(x-3\right)=45\)
\(5.\left(x-3\right)\) \(=70-45\)
\(5.\left(x-3\right)\) \(=25\)
\(x-3\) \(=25:5\)
\(x-3\) \(=5\)
Vậy \(x=5\)
70 - 5 .(x - 3) = 45
=> 5.(x - 3) = 70 - 45
=> 5.(x - 3) = 25
=> x - 3 = 25 : 5
=> x - 3 = 5
=> x = 5 + 3
=> x = 8