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a) \(3x-18.28:14=308\)
\(=>3x-36=308\)
\(=>3x=344\)\(\)
\(=>x=\frac{344}{3}\)
\(\)b)\(38+\left|x\right|=\left(-12\right)+65\)
\(=>38+\left|x\right|=53=>\left|x\right|=15=>\orbr{\begin{cases}x=15\\x=-15\end{cases}}\)
c)\(15+3.\left(x-1\right):5=30\)
\(=>15+3.\left(x-1\right)=150\)
\(=>3.\left(x-1\right)=135\)
\(x-1=45=>x=46\)
d) \(5.\left(7-3x\right)+7.\left(2+2x\right)=1\)
\(=>35-15x+14+14x=1\)
\(=>49-x=1=>x=48\)
e)\(3.\left(x-7\right)=21\)
\(=>x-7=7=>x=14\)
g)\(\left[\left(6x-72\right):2-84\right]:28=5628\)
\(\left(6x-72\right):2-84=157584\)
\(\left(6x-72\right):2=157668\)
\(6x-72=315336\)
\(6x=315408=>x=52568\)
h)\(123-5\left(x+4\right)=28\)
\(5.\left(x+4\right)=95\)
\(x+4=19=>x=15\)
p)\(14.\left(x-3\right)-138=73\)
\(14.\left(x-3\right)=211\)
\(x-3=\frac{211}{14}=>x=\frac{253}{14}\)
\(t\)
\(\left|x\right|-5=2\)
\(\left|x\right|=7=>\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)
v)\(4x-72=\left|100-8.25\right|\)
\(4x-72=\left|-100\right|\)
\(4x-72=100=>4x=172=>x=43\)
cậu có thể tham khảo bài làm trên đây ạ, chúc cậu học tốt ^^
6) \(2\left(x-8\right)=2^2\)
\(\Rightarrow x-8=2^2:2\)
\(\Rightarrow x-8=2\)
\(\Rightarrow x=2+8\)
\(\Rightarrow x=10\)
tíc mình nha
5) 14 chia hết cho 2x+3
=>2x+3 thuộc ước 14
mà Ư(14)={1,2,7,14}
ta có
| 2x+3 | 1 | 2 | 3 | 14 |
| x | X | X | 0 | X |
vậy x=0
a)\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x=72+138\)
\(2.x=210\)
\(x=210\div2\)
\(x=105\)
b)\(\left\{\left(6x-72\right)\div2-84\right\}.28=5628\)
\(\left(6x-72\right)\div2-84=201\)
\(\left(6x-72\right)\div2=285\)
\(6x-72=570\)
\(6x=642\)
\(x=107\)
c)\(420+65.4=\left(x+175\right)\div5+30\)
\(420+260=\left(x+175\right)\div5+30\)
\(680=\left(x+175\right)\div5+30\)
\(650=\left(x+175\right)\div5\)
\(3250=x+175\)
\(3075=x\)
1) 6x+2=216=63
=>x+2=3
=>x=1
2)72-(15+x)=5.22
49-15-x=5.4
34-x=20
x=14
3)[(6x-72):2-84].28=5628
(3x-36-84).28=5628
3x-36-84=201
3x-120=201
3x=321
x=107
4)3x-2.4=324
3x-2=81=34
=>x-2=4
x=6
\(6^{x+2}=216\Leftrightarrow6^x=216:6^2=6;x=1\)\(7^2-\left(15+x\right)=5.2^2\Leftrightarrow49-\left(15+x\right)=20\)
\(15+x=49-20=29;x=14\)
a) Xem lại đề.
b) 5. (x - 3)2 + 17 = 142
5. (x - 3)2 = 142 - 17
5. (x - 3)2 = 125
(x - 3)2 = 125 : 5
(x - 3)2 = 25
(x - 3)2 = 52 (cùng số mũ)
⇒ x - 3 = 5
x = 5 + 3 = 8
c) [(6x - 72) : 2 - 84] . 28 = 5628
[(6x - 72) : 2 - 84] = 5628 : 28
[(6x - 72) : 2 - 84] = 201
(6x - 72) : 2 = 201 + 84
(6x - 72) : 2 = 285
6x - 72 = 285. 2
6x - 72 = 570
6x = 570 + 72
6x = 642
x = 642 : 6
x = 107
5.(x-4)=123-38
5.(x-4)=85
x-4=85:5
x-4=17
x=17+4
x=21
Đúng 1000000000000000
a: =>4(x-3)=49-1=48
=>x-3=12
=>x=15
b: =>123-5(x+4)=38
=>5(x+4)=123-38=85
=>x+4=17
=>x=13
c: =>2x-138=9*8=72
=>2x=72+138=210
=>x=105
a)[(6x-72)/2-84]/28=5628
(6x-72)/2-84=5628*28
3x-36-84=157584
3x=157584+36+84
3x=157704
x=157704/3
x=52568
b)14(x-3)-138=8*9
14(x-3)=72+138
x-3=210/14
x-3=15
x=15+3
x=18
c)2*3x-2*92=4*33
2*(3x-34)=2*2*33
3x=54+81
3x=135
nên x\(\in\phi\)