Tìm x:
a. 35x2 - 49= 10x22
Bài3:Tìm x:
a) 71 – (33 + x) = 26 b) (x + 73) – 26 = 76 c) 45 – (x + 9) = 6 d) 89 – (73 – x) = 20 e) 4(x + 41) = 400 f) 11(x – 9) = 77 | g) (x + 7) – 25 = 13 h) 198 – (x + 4) = 120 i) 5(x – 9) = 350 j) 2x – 49 = 5.32 k) 25 + 3(x – 8) = 106 l) 32(x + 4) – 52 = 5.22 | m) 200 – (2x + 6) = 43 n) 2(x- 51) = 2.23 + 20 o) 450 : (x – 19) = 50 p) 4(x – 3) = 72 – 110 q) 156 – (x+ 61) = 82 r) (x-35) -120 = 0 |
a: Ta có: \(71-\left(x+33\right)=26\)
\(\Leftrightarrow x+33=45\)
hay x=12
b: Ta có: \(\left(x+73\right)-26=76\)
\(\Leftrightarrow x+73=102\)
hay x=29
c: Ta có: \(45-\left(x+9\right)=6\)
\(\Leftrightarrow x+9=39\)
hay x=30
a) 71 - ( 33 + x ) = 26
(33 + x ) = 71 -26
33 + x = 45
x = 45 - 33 = 12
b) ( x + 73 ) - 26 = 76
( x + 73 ) = 102
x = 102 - 73 = 29
c) 45 - ( x + 9 ) = 6
( x + 9 ) = 45 - 6 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69 = 4
e) 4(x+41) = 400
x + 41 = 400 : 4 = 100
x = 100 - 41 = 59
f) 11(x-9 ) = 77
x - 9 = 77 : 11 = 7
x = 7 + 9 = 16
g) x + 7 = 25 + 13 = 38
x = 38 - 7 = 31
h) x + 4 = 198 - 120 = 78
x = 78 - 4 = 74
i) x - 9 = 350 : 5 = 70
x = 70 + 9 = 79
j) 2x - 49 = 5 . 9 = 45
2x = 45 + 49 = 94
x = 94 : 2 = 47
k) 25 + 3( x - 8 ) = 106
3(x-8 ) = 106 - 25 = 81
x - 8 = 81 : 3 = 27
x = 27 +8= 35
l) 9( x + 4 ) - 25 = 20
9( x + 4 ) = 20 + 25 = 45
x + 4 =45 : 9 = 5
x = 5 - 4 = 1
m) 200 - ( 2x + 6 ) = 64
2x + 6 = 200 - 64 = 136
2x = 136 - 6 = 130
x = 130 : 2 = 65
n) 2(x-51) = 16 + 20 = 36
x - 51 = 36 : 2 = 13
x = 13 + 51 = 64
o) 450 : ( x - 19 ) = 50
x - 19 = 450 : 50 = 9
x = 19 + 9 = 28
p)4(x-3) = 49 - 1 = 48
x - 3 = 48 : 4 = 12
x + 15
q) 156 - ( x+61 ) = 82
x + 61 = 156 - 82 = 74
x = 74 - 61 = 13
r) ( x - 35 ) - 120 = 0
x - 35 = 120
x = 120 + 35 = 155
Không thực hiện phép tính hãy tìm chữ số x thoả mãn 35x2<35x6
Tìm a để đa thức A chia hết cho đa thức B với:
A = 5 x 5 - 26 x 3 + 35 x 2 - 24x + a + 8 và B = x 3 - 6x + 7.
Tính:
35 x 2 26 x 4 32 x 6 20 x 7
Tìm x:
a)
b)
c)
x=\(\dfrac{3}{2}-\dfrac{4}{5}=\dfrac{7}{10}\)
a) x + 4/5 = 3/2
x = 3/2 - 4/5
x = 7/10
b) x - 3/2 = 11/4
x = 11/4 + 3/2
x = 17/4
c) 25/3 - x = 5/6
x = 25/3 - 5/6
x = 15/2
Tìm x:
a, (x - 1)^2 = 1
1. Tìm x:
a) 1,5 - 2 . /x/ = -0,5
a)\(1,5-2\left|x\right|=-0,5\)
\(\Leftrightarrow2\left|x\right|=1,5+0,5\)
\(\Leftrightarrow\left|x\right|=1\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
Tìm x:
a)x+5/8=9/3
\(x+\dfrac{5}{8}=\dfrac{9}{3}\)
\(x=\dfrac{9}{3}-\dfrac{5}{8}=\dfrac{19}{8}\)
Tìm x:
a) [2040 : (47 - 3x) + 33] . 11 = 1683
\(\left[2040:\left(47-3x\right)+33\right].11=1683\)
\(\Leftrightarrow2040:\left(47-3x\right)+33=153\)
\(\Leftrightarrow2040\left(47-3x\right)=120\)
\(\Leftrightarrow47-3x=17\)
\(\Leftrightarrow3x=30\Leftrightarrow x=10\)