BÀI 1:TÌM X THUỘC SỐ TỰ NHIÊN
3636:(12X-91)=36
(X:23+45)*67=8911
1LIKE
3636:(12x -91)=36
( x:23+45 ) ×67= 8911
a/ \(3636\div\left(12x-91\right)=36\)
\(12x-91=3636\div36\)
\(12x-91=101\)
\(12x=101+91\)
\(12x=192\)
\(x=192\div12\)
\(x=16\)
b/ \(\left(x\div23+45\right)\times67=8911\)
\(x\div23+45=8911\div67\)
\(x\div23+45=133\)
\(x\div23=133+45\)
\(x\div23=178\)
\(x=178\times23\)
\(x=4094\)
tìm x biết :
a , ( x + 74 ) -318 =200
b , 3636 : ( 12x - 91 ) = 36
c , ( x : 23 + 45 ) . 67 = 8911
\(a,\left(x+74\right)-318=200\)
\(\left(x+74\right)=200+318\)
\(\left(x+74\right)=518\)
\(x=518-74\)
\(x=444\)
\(b,3636:\left(12x-91\right)=36\)
\(\left(12x-91\right)=3636:36\)
\(\left(12x-91\right)=101\)
\(12x=101+91\)
\(12x=192\)
\(x=192:12\)
\(x=16\)
\(\left(x:23+45\right).67=8911\)
\(\left(x:23+45\right)=8911:67\)
\(\left(x:23+45\right)=133\)
\(x:23=133-45\)
\(x:23=88\)
\(x=88.23\)
\(x=2024\)
Mk ko ghi lại đề mà làm tiếp luôn nha!
a) (ĐỀ)
x+74=200+318
x+74=518
x =518-74
x =444
b) (ĐỀ)
12x-91=3636:36
12x-91=101
12x =101+91
12x = 192
x = 192:12
x = 16
c) (ĐỀ)
x:23+45=8911:67
x:23+45= 133
x:23 =133-45
x:23 = 88
x = 88.23
x = 2024
K cho mk nha bn!
a ) (x+74 ) - 218 = 200 \(\Leftrightarrow\) x+74-218 = 200 \(\Leftrightarrow\) x= 200+218+74 \(\Leftrightarrow\) x= 492 vậy x = 492 b, 3636 : ( 12x -91) =36 \(\Leftrightarrow\)12x-91 = 3636: 36 \(\Leftrightarrow\)12x-91 = 101 \(\Leftrightarrow\) 12x = 101+91 \(\Leftrightarrow\) 12x = 192 \(\Leftrightarrow\) x= 16 vậy x = 16
c, ( x : 3 +45 ) . 67 = 8911 \(\Leftrightarrow\) x : 3 +45 = 8911: 67 \(\Leftrightarrow\) x : 3 = 133 - 45 \(\Leftrightarrow\) x : 3 = 88 \(\Leftrightarrow\) x= 88 . 3 \(\Leftrightarrow\) x=264
vậy x= 264
a, ( x + 74 ) - 318 = 200
b, 3636 : ( 12x - 91 ) = 36
c, ( x : 23 + 45 ) . 67 = 8911
a) (x + 74) - 318 = 200
x + 74 = 200 + 318
x + 74 = 518
x = 518 - 74
x = 444
b) 3636 : (12x - 91) = 36
12x - 91 = 3636 : 36
12x - 91 = 101
12x = 101 + 91
12x = 192
x = 192 : 12
x = 16
c) (x : 23 + 45) . 67 = 8911
x : 23 + 45 = 8911 : 67
x : 23 + 45 = 133
x : 23 = 133 - 45
x : 23 = 88
x = 88 . 23
x = 2024
a. ( x + 74 ) - 318 = 200
x + 74 = 518
x = 444
BÀI 5: Tim x biết:
a) 3636:(12x-91) =36
b) (x : 23+45).67=8911
c) 420+65.4 =(x+175):5+30
d) (32.15):2=(x+70):14-10
e)x-4867=(175.2-50.70):25+23
a) 3636:(12x-91) =36
12x-91 = 3636:36
12x-91=101
12x=101+91
12x=192
x=192:12
x=16
b) (x : 23+45).67=8911
(x : 23+45)=8911:67
(x : 23+45)=133
x:23=133-45
x:23=88
x=88.23
x=2024
c) 420+65.4 =(x+175):5+30
420+260=(x+175):5+30
680=(x+175):5+30
(x+175):5=680-30
(x+175):5=650
(x+175)=650x5
(x+175)=3250
x=3250-175
x=3075
d) (32.15):2=(x+70):14-10
480:2=(x+70):14-10
240=(x+70):14-10
(x+70):14=240+10
(x+70):14=250
(x+70)=250.14
(x+70)=3500
x=3500-70
x=3430
e)x-4867=(175.2-50.70):25+23
x-4867=(350-3500):25+23
x-4867=-3150:25+23
x-4867=-126+23
x-4867=-103
x=-103+4867
x=4764
BÀI 5: Tim x biết:
a) 3636:(12x-91) =36
b) (x : 23+45).67=8911
c) 420+65.4 =(x+175):5+30
d) (32.15):2=(x+70):14-10
e)x-4867=(175.2-50.70):25+23
Tìm X
a ) ( X + 74 ) - 318 = 200 b ) 3636 / ( 12x -91 ) = 36
c) ( X / 23 + 45 ) * 67 =8911
a ) \(\left(x+74\right)-318=200\)
\(\left(x+74\right)=200+318\)
\(x+74=518\)
\(x=518-74\)
\(x=444\)
Vậy \(x=444\)
b ) \(3636:\left(12x-91\right)=36\)
\(\left(12x-91\right)=3636:36\)
\(12x-91=101\)
\(12x=101+91\)
\(12.x=192\)
\(x=192:12\)
\(x=16\)
Vậy \(x=16\)
c ) \(\left(x:23+45\right).67=8911\)
\(\left(x:23+45\right)=8911:67\)
\(x:23+45=133\)
\(x:23=133-45\)
\(x:23=88\)
\(x=88.23\)
\(x=2024\)
Vậy \(x=2024\)
Chúc bạn học tốt !!!
tìm x
67 - 3x = 31 , 18 + 3x =24
( x - 36 ) : 18 = 12 , ( x + 74 ) - 318 = 200
3636 : ( 12x - 91 ) = 36 ,
( x : 23 + 45 ) x 67 = 8911
các bạn giúp mình với
tìm x
67 - 3x = 31
=> 3x = 36
=> x = 12 ,
18 + 3x =24
=> 3x = 6
=> x = 2
( x - 36 ) : 18 = 12
=> x - 36 = 216
=> x = 252
, ( x + 74 ) - 318 = 200
=> x + 74 = 518
=> x = 444
3636 : ( 12x - 91 ) = 36 ,
=> 12x - 91 = 101
=> 12x = 192
=> x = 16
( x : 23 + 45 ) x 67 = 8911
=> x : 23 + 45 = 133
=> x : 23 = 88
=> x = 2024
Tìm x
67 - 3x = 31
=> 3x = 67 - 31
=> 3x = 46
=> x = 46/3
18 + 3x = 24
=> 3x = 24 - 18
=> 3x = 6
=> x = 2
(x - 36) : 18 = 12
x - 36 = 12.18
x - 36 = 216
x = 216 + 36
x = 252
(x + 74) - 318 = 200
x + 74 = 200 + 318
x + 74 = 518
x = 518 - 74
x = 444
3636 : (12x - 91) = 36
12x - 91 = 3636 : 36
12x - 91 = 101
12x = 101 + 91
12x = 192
x = 16
(x : 23 + 45) x 67 = 8911
x : 23 + 45 = 8911 : 67
x : 23 + 45 = 133
x : 23 = 133 + 45
x : 23 = 178
x = 4094
\(67-3x=31\)
\(3x=36\)
\(x=12\)
\(18+3x=24\)
\(3x=6\)
\(x=2\)
\(\left(x-36\right):18=12\)
\(x-36=216\)
\(x=252\)
\(\left(x+74\right)-318=200\)
\(x+74=518\)
\(x=444\)
\(3636:\left(12x-91\right)=36\)
\(12x-91=101\)
\(12x=192\)
\(x=12\)
\(\left(\frac{x}{23}+45\right).67=8911\)
\(\frac{x}{23}+45=133\)
\(\frac{x}{23}=88\)
\(\Rightarrow\frac{x}{23}=\frac{2024}{23}\)
\(\Rightarrow x=2024\)
Bài 5.Tìm x N, sao cho:
a)3636 : (12x –91) = 36
b)(x : 23 + 45) . 67 = 8911
c)[(6x –39) : 7]. 4 = 12
d)(3x –24). 73= 2. 74
e)x(x –10) = 0
f)(x+ 1). (x –2) = 0
g)(9 –x)3= 64
h)3x= 81
i)2 . 3x= 10 . 312+ 8 . 312
j)(19x + 2.52) : 14 = (13 -8)2-42
\(a,\Rightarrow12x-91=101\\ \Rightarrow12x=192\\ \Rightarrow x=16\\ b,\Rightarrow x:23+45=133\\ \Rightarrow x:23=88\\ \Rightarrow x=\dfrac{88}{23}\\ c,\Rightarrow\left(6x-39\right):7=3\\ \Rightarrow6x-39=21\\ \Rightarrow6x=60\\ \Rightarrow x=10\\ d,\Rightarrow3x-24=\dfrac{148}{73}\\ \Rightarrow3x=\dfrac{1900}{73}\\ \Rightarrow x=\dfrac{1900}{219}\\ e,\Rightarrow\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\\ f,\Rightarrow\left[{}\begin{matrix}x=-1\\x=2\end{matrix}\right.\\ d,\left(9-x\right)^3=64=4^3\\ \Rightarrow9-x=4\\ \Rightarrow x=5\\ h,\Rightarrow x=27\\ i,\Rightarrow6x=312\cdot12=624\cdot6\\ \Rightarrow x=624\\ j,\Rightarrow\left(19x+104\right):14=25-42=-17\\ \Rightarrow19x+104=-238\\ \Rightarrow19x=-342\\ \Rightarrow x=-18\)
Tìm số tự nhiên x ( x Thuộc N biết )\
a) x + 74 - 18 = 200
b) 3636 : ( x - 5 ) = 36
c) ( x : 23 + 45 ) . 67 = 8911
d) 1 + 3 + 5 + ... + x = 1600 ( x là số lẻ )
a) x + 74 - 18 = 200
x + 74 = 200 + 18
x + 74 = 218
x = 218 - 74
x = 144
b) 3636 : ( x - 5 ) = 36
x - 5 = 3636 : 36
x - 5 = 101
x = 101 + 5
x = 106
c) ( x : 23 + 45 ) . 67 = 8911
x : 23 + 45 = 8977 : 67
x : 23 + 45 = 133
x : 23 = 133 - 45
x : 23 = 88
x = 88 . 23
x = 2024
d) lý thuyết đã có: số các số lẻ từ số lẻ a đến số lẻ b là (b-a)/2 + 1 số
=> từ 1 đến x có (x-1)/2 + 1 =(x+1)/2 số (x là số lẻ)
xét tổng S = 1 + 3 + 5 + ......+ x có (x+1)/2 số hạng (1) khi đó ta có
S = x + (x - 2) + .......+1 có (x+1)/2 số hạng (2) . Từ (1) và (2) ta có :
2S = (x+1) + (x+1) + ......+ (x+1) trong tổng này có (x+1)/2 số hạng (x+1)
=> 2.S = (x+1).(x+1)/2 => S = (x+1)^2/4
Theo bài ra thì S=1600 => (x+1)^2/4 = 1600 => (x+1)^2 =6400= 80^2
=>x+1 = 80 => x = 79
P/s: Câu d nguồn mạng :))
a, x+74-18=200 b, 3636:(x-5)=36 c,(x:23+45).67=8911
x+74=200+18 x-5=3636:36 x:23+45=8911:67
x+74=218 x-5=101 x:23+45=133
x=218-74 x=101+5 x:23 =133-45
x= 144 x=106 x:23 =88 x=88.23=2024
\(a.x+74-18=200\)
\(x\) \(=200+18-74\)
\(x\) \(=144\)
Vậy \(x=144\)
\(b.3636:\left(x-5\right)=36\)
\(x-5=3636:36\)
\(x-5=101\)
\(x\) \(=101+5\)
\(x\) \(=106\)
Vậy \(x=106\)
\(c.\left(x:23+45\right).67=8911\)
\(x:23+45\) \(=8911:67\)
\(x:23+45\) \(=133\)
\(x:23\) \(=133-45\)
\(x:23\) \(=88\)
\(x\) \(=88.23\)
\(x\) \(=2024\)
Vậy \(x=2024\)
\(d.1+3+5+...+x=1600\)(x là số lẻ)