Bài 2: Tìm x
a)3636÷(12×x-91)=36
b)446+2×(125-x)=546
c)(x-36)÷18=10+2
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Những câu hỏi liên quan
2 tháng 12 2021
\(a,\Rightarrow12x-91=101\\ \Rightarrow12x=192\\ \Rightarrow x=16\\ b,\Rightarrow x:23+45=133\\ \Rightarrow x:23=88\\ \Rightarrow x=\dfrac{88}{23}\\ c,\Rightarrow\left(6x-39\right):7=3\\ \Rightarrow6x-39=21\\ \Rightarrow6x=60\\ \Rightarrow x=10\\ d,\Rightarrow3x-24=\dfrac{148}{73}\\ \Rightarrow3x=\dfrac{1900}{73}\\ \Rightarrow x=\dfrac{1900}{219}\\ e,\Rightarrow\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\\ f,\Rightarrow\left[{}\begin{matrix}x=-1\\x=2\end{matrix}\right.\\ d,\left(9-x\right)^3=64=4^3\\ \Rightarrow9-x=4\\ \Rightarrow x=5\\ h,\Rightarrow x=27\\ i,\Rightarrow6x=312\cdot12=624\cdot6\\ \Rightarrow x=624\\ j,\Rightarrow\left(19x+104\right):14=25-42=-17\\ \Rightarrow19x+104=-238\\ \Rightarrow19x=-342\\ \Rightarrow x=-18\)
T
21 tháng 7 2018
Bai 1 :
a/ \(x:1,4+2,8=8,4\)
\(x:1,4=8,4-2,8\)
\(x:1,4=5,6\)
\(x=5,6\times1,4\)
\(x=7,84\)
b/ \(2,8:x-1,5=2,3:5,75\)
\(2,8:x-1,5=\frac{2}{5}\)
\(2,8:x=\frac{2}{5}+1,5\)
\(2,8:x=\frac{19}{10}=1,9\)
\(\Rightarrow x=2,8:1,9=\frac{28}{19}\)
Bai 2 :
a/ \(575-\left(6\times x+70\right)=445\)
\(6\times x+70=575-445\)
\(6\times x+70=130\)
\(6\times x=130-70\)
\(\Rightarrow6\times x=60\Rightarrow x=10\)
b/ \(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(\Rightarrow x=5\)
c/ \(\left(x-105\right):21=15\)
\(x-105=15\times21\)
\(x-105=315\)
\(\Rightarrow x=420\)
d/ \(3636:\left(12\times x-91\right)=36\)
\(12\times x-91=3636:36\)
\(12\times x-91=101\)
\(12\times x=101+91\)
\(12\times x=192\)
\(\Rightarrow x=16\)
e/ \(12\times\left(x-5\right)+73=20\)
\(12\times\left(x-5\right)=20-73\)
\(12\times\left(x-5\right)=-53\)
\(x-5=-53:12\)
\(x-5=\frac{-53}{12}\)
\(\Rightarrow x=\frac{-53}{12}+5\)
\(\Rightarrow x=\frac{7}{12}\)
f/ \(\left[\left(10-x\right)\times2+5\right]:3-2=3\)
\(\left[\left(10-x\right)\times2+5\right]:3=3+2\)
\(\left[\left(10-x\right)\times2+5\right]:3=5\)
\(\left[\left(10-x\right)\times2+5\right]=5\times3\)
\(\left(10-x\right)\times2+5=15\)
\(\left(10-x\right)\times2=15-5\)
\(\left(10-x\right)\times2=10\)
\(10-x=10:2\)
\(10-x=5\)
\(\Rightarrow x=5\)
7 tháng 7 2017
A . 3636 : ( 12 x X - 91 ) = 36
( 12 x X - 91 ) = 3636 : 36
( 12 x X - 91 ) = 101
12 x X = 101 + 91
12 x X = 192
X = 192 : 12
X = 16
B . (X: 22+ 45) x67= 8911
(X: 22+ 45) = 8911 : 67
(X: 22+ 45) = 133
X: 22 = 133 - 45
X: 22 = 88
X = 88 x 22
X = 1936
C . (X +74) -318= 200
X + 74 = 200 + 318
X + 74 = 518
X = 518 - 74
X = 444
D . 5x X- 18 = 8+9
5x X - 18 = 17
5x X = 17 + 18
5x X = 35
X = 35 : 5
X = 7
L . 1440: (125- X) =12
125 - X = 1440 : 12
125 - X = 120
X = 125 - 120
X = 5
K MÌNH NHA !!!
ND
3
23 tháng 7 2015
3636 : 36 = 101
101 + 91 = 192
192 : 12 = 16 vậy x = 16 tick đúng nha Nguyễn Đan Khanh
23 tháng 7 2015
3636 : ( 12 . x - 91 ) = 36
12 . x - 91 = 3636 : 36
12 . x - 91 = 101
12 . x = 101 + 91
12 . x = 192
x = 192 : 12
x = 16
11 tháng 6 2021
3636 : (12 . x - 91) = 36
12 . x - 91 = 3636 : 36
12 . x - 91 = 101
12 . x - 91 = 101 + 91
12 . x = 192
x = 192 : 12
x = 16
Vậy x = 16
a: \(3636:\left(12\cdot x-91\right)=36\)
=>\(12x-91=\frac{3636}{36}=101\)
=>12x=91+101=192
=>\(x=\frac{192}{12}=16\)
b: \(446+2\cdot\left(125-x\right)=546\)
=>\(2\left(125-x\right)=546-446=100\)
=>125-x=50
=>x=125-50=75
c: \(\left(x-36\right):18=10+2\)
=>\(\left(x-36\right):18=12\)
=>\(x-36=18\cdot12=216\)
=>x=216+36=252