Tìm X , 318-X:6=206
Bài 1 Thực hiện phép tính
a. 369 – (|- 206| – 15) – (- 206 + |- 369|)
b. 345 – 150 : [(33 – 24)2 – (– 21)] + 20160
c. – 2 + 6 – 12 + 16 – 22 + 26 –…– 92 + 96
Bài 2 Tìm x ∈ Z biết:
a. 20 – [42 + (x – 6)] = 90
b. 24 – |x + 8| = 3.(25 – 52)
c. 1000 : [30 + (2x – 6)] = 32 + 42 và x ∈ N
d. (x + 11) ⋮ (x + 2) và x ∈ N
tìm x biết a, 1+1/3+1/6+1/10+.....+1/x.(x+1):2=1 1/1993
b,(x+8)+(x+9)+(x+10)+....+206+207=2007
318-5 (x-64)=103
4mũ x . 5 +216=296
376-6 mũ x :3=364
(4x -1) mũ 2=121
\(318-5\left(x-64\right)=103\)
\(\Rightarrow5\left(x-64\right)=318-103\)
\(\Rightarrow5\left(x-64\right)=215\)
\(\Rightarrow x-64=43\)
\(\Rightarrow x=43+64\)
\(\Rightarrow x=107\)
_____________
\(4^x\cdot5+216=296\)
\(\Rightarrow4^x\cdot5=296-216\)
\(\Rightarrow4^x\cdot5-80\)
\(\Rightarrow4^x=16\)
\(\Rightarrow4^x=4^2\)
\(\Rightarrow x=2\)
___________
\(376-6^x:3=364\)
\(\Rightarrow6^x:3=376-364\)
\(\Rightarrow6^x:3=12\)
\(\Rightarrow6^x=36\)
\(\Rightarrow6^x=6^2\)
\(\Rightarrow x=2\)
___________
\(\left(4x-1\right)^2=121\)
\(\Rightarrow\left(4x-1\right)^2=11^2\)
\(\Rightarrow\left[{}\begin{matrix}4x-1=11\\4x-1=-11\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}4x=12\\4x=-10\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{5}{2}\end{matrix}\right.\)
Tìm x biết : x : 431 + 206 = 742
\(x:431+206=742\)
\(x:431=742-206\)
\(x:431=536\)
\(x=536\times431\)
\(x=\text{231016}\)
x : 431 + 206 = 742
x : 431 = 742 - 206
x : 431 = 536
x = 536 x 431
x = 231016
X : 431 + 206 = 742
X : 431 = 742 - 206
X : 431 = 536
X = 536 x 431
X = 231016
CHÚC CÁC BẠN HỌC TỐT NHÉ⚽
Tìm x biết:
\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+.......+\frac{2}{x.\left(x+1\right)}=\frac{206}{208}\)
Bài 1 : Tìm x :
a ) ( x + 74 ) - 318 = 200 .
b ) 3636 : ( 12 x \(x\)- 91 ) = 36 .
c ) ( \(x\): 23 + 45 ) x 67 = 8911 .
d ) ( 3 x \(x\)- 6 ) + 57 = 60 .
a ) ( x + 74 ) - 318 = 200
x + 74 = 200 + 318
x + 74 = 518
x = 518 - 74
x = 444
b ) 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
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
d ) ( 3 . x - 6 ) + 57 = 60
3 . x - 6 = 60 - 57
3 . x - 6 = 3
3 . x = 3 + 6
3 . x = 9
x = 9 : 3
x = 3
\(a)\) \(\left(x+74\right)-318=200\)
\(x+74=518\)
\(x=444\)
Vậy x = 444
\(b)\) \(3636:\left(12x-91\right)=36\)
\(12x-91=101\)
\(12x=192\)
\(x=16\)
Vậy x = 16
\(c)\) \(\left(x:23+45\right)67=8911\)
\(x:23+45=133\)
\(x:23=88\)
\(x=2024\)
Vậy x = 2024
\(d)\left(3x-6\right)+57=60\)
\(3x-6=3\)
\(3x=9\)
\(x=3\)
Vậy x = 3
tìm x biết
(x+74)+318=200
( x + 74 ) + 318 = 200
x + 74 = 200 - 318
x + 74 = -118
x = - 118 - 74
x = -192
( x + 74 ) + 318 = 200
x + 74 = 200 - 318
x + 74 = -118
x = -118 - 74
x = -192
( x + 74 ) + 318 = 200
x + 74 = 200 - 318
x + 74 = -118
x = -118 - 74
x = -192
bài 1 : Tính hợp lý
a) -418 - { -218 - [ -118 - ( -318 ) + 2012 ] }
b) 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... - 79 - 80 +81
bài 2 : Tìm x
a) ( -1 ) + 3 + ( -5 ) + 7 + ... + x = 600
b) 2 + ( -4 ) + 6 + ( -8 ) + .... + ( -x) = -2000
BÀI 2: TÍNH GIÁ TRỊ CỦA BIỂU THỨC
161 : 23 x 754 336 : 28 x 78 810 : 90 x 844
792 : 88 x 999 927 : 3 + 318 : 3 528 : 6 – 384 : 6
tìm x biết :(x+8)+(x+9)+(x+10)+.....+206+207=2007