tìm x biết
(2x+5).|-7| = 73
Tìm số tự nhiên x biết:
7⁵ : 73 - x = 23
( 2x -7 ).5⁸=5¹⁰
\(7^5:7^3-x=23\)
\(7^2-x=23\)
\(49-x=23\)
\(x=49-23\)
\(x=26\)
\(\left(2x-7\right).5^8=5^{10}\)
\(\left(2x-7\right)=5^{10}:5^8\)
\(2x-7=5^{10-8}\)
\(2x-7=5^2\)
\(2x-7=25\)
\(2x=32\)
\(x=32:2\)
\(x=16\)
* Mình nghĩ câu a sửa đề như vậy sẽ đúng hơn!
(2x+5).7=73
tìm x
(2x+5).7=73
<=>2x.7+5.7=73
<=>14x+35=73
<=>14x=73-35
<=>14x=38
<=>x=38:14
=>x= 17/7
Tìm x
( 2x + 5 ) . | -7 | = 73
(2x+5) . l-7l = 73
=(2x+5) . 7 =73
=(2x+5) =\(\frac{73}{7}\)
=2x =\(\frac{73}{7}\) - 5
=2x =\(\frac{38}{7}\)
=x =\(\frac{38}{7}\) :2
=x =\(\frac{19}{7}\)
(2x+5).|-7|=73
=> (2x+5).7=73
=> 2x+5=73:7
=> 2x+5=\(\frac{73}{7}\)
=>2x=\(\frac{73}{7}\)-5
=>2x=\(\frac{38}{7}\)
=>x=\(\frac{38}{7}\):2
=>x=\(\frac{19}{7}\)
vậy.....
giúp tôi với : tìm x : ( 2x+5 ) .7 = 73
Tìm x :
(2x+5) x 7 = 73
Ta có:\(\left(2x+5\right)\times7=73\)
\(\Rightarrow2x+5=\frac{73}{7}\)
\(\Rightarrow2x=\frac{73}{7}-5\)
\(\Rightarrow2x=\frac{38}{7}\Rightarrow x=\frac{19}{7}\)
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
tìm x
x - 48 : 3 = 12 (2x + 5) . | - 7| = 73
x - 48 : 3 = 12
x - 16 = 12
x = 12 + 16
x = 28
còn câu thứ 2 thì chia có dư bạn xem lại xem có chép sai đầu bài ko
Bài 8. Tìm x ϵ N biết:
a) x3=27
b) (2x-1)3=8
c) (x-2)2=16
d) (2x – 3)2=9
e) 2x+5=34:32
f) (3x-24).73=2.74
Bài 8. Tìm x ϵ N biết:
a) x3=27
b) (2x-1)3=8
c) (x-2)2=16
d) (2x – 3)2=9
e) 2x+5=34:32
f) (3x-24).73=2.74