Tim x€n
a.71.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
Cac ban giup minh nha
Minh can ngay bay gio
Tim x€n
a.72.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
Tim x€n
a.72.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
6/5/12:2/3/4+11/1/4 x(1/3-1/5)
Giup minh nha minh can gap ngay bay gio
mk viết đáp án rồi bn tự giải nha
=169/15
Tim x
a.142.4^2-(7.5^2+4.x)=(4^3.157):4^2
b.[(7x+23):6^2-5^2]:29=18^2
Cac ban giup minh nha minh can ngay hom nay
a) \(142\cdot4^2-\left(7\cdot5^2+4x\right)=\left(4^3\cdot157\right):4^2\)
\(\Leftrightarrow142\cdot16-\left(7\cdot25+4x\right)=\left(64\cdot157\right):16\)
\(\Leftrightarrow2272-\left(175+4x\right)=10048:16\)
\(\Leftrightarrow2272-145-4x=628\)
\(\Leftrightarrow2097-4x=628\)
\(\Leftrightarrow-4x=-1469\)
\(\Leftrightarrow x=\dfrac{1469}{4}\)
Vậy \(x=\dfrac{1469}{4}\)
b) \(\left[\left(7x+23\right):6^2-5^2\right]:29=18^2\)
\(\Leftrightarrow\left(\dfrac{7x+23}{6^2}-25\right)\cdot\dfrac{1}{29}=18\)
\(\Leftrightarrow\left(\dfrac{7x+23}{36}-25\right)\cdot\dfrac{1}{29}=18\)
\(\Leftrightarrow\dfrac{7x+23-900}{36}\cdot\dfrac{1}{29}=18\)
\(\Leftrightarrow\dfrac{7x-877}{36}\cdot\dfrac{1}{29}=18\)
\(\Leftrightarrow\dfrac{7x-877}{1044}=18\)
\(\Leftrightarrow7x-877=18792\)
\(\Leftrightarrow7x=18792+877\)
\(\Leftrightarrow7x=19669\)
\(\Leftrightarrow x=\dfrac{19669}{7}\)
tìm x \(\in\) N
a)71.2 - 6 . (2x+5) = 105 : 103
b)(5x + 34) . 68 = 69 . 34
a, Ta có: \(142-\left(12x+30\right)=10^{5-3}\)
\(=>142-12x-30=10^2\)
\(112-12x=100\)
\(=>12x=112-100=12=>x=1\)
Vậy số cần tìm là 1;
b, Ta có: \(=>\left(5x+3^4\right)=6^9:6^8.3^4\)
\(=>5x+3^4=6.3^4=>5x=6.3^4-3^4\)
\(=>5x=5.3^4=>x=3^4=81\)
Vậy x=81;
CHÚC BẠN HỌC TỐT.......
Ta có: \(71.2-6(2x+5)=10^5:10^3\)
\(\Rightarrow142-12x-30=10^2\)
\(\Rightarrow142-30-10^2=12x\)
\(\Rightarrow142-30-100=12x\)
\(\Rightarrow12=12x\)
\(\Rightarrow x=\dfrac{12}{12}\)
\(\Rightarrow x=1\)
Vậy \(x=1\)
tìm x \(\in\) N
a)71.2 - 6 . (2x+5) = 105 : 103
b)(5x + 34) . 68 = 69 . 34
a) 71.2-6(2x+5)=105:103
<=> 71.2-6(2x+5)=102
142-6(2x+5)=100
6(2x+5)=142-100
6(2x+5)=42
2x+5=7
2x=7-5
2x=2
x=2:2
x=1
1, tim x
5+x-3=5-(x+4)
x-(5|-7|+3)=|-8|+6-2
|x-3|+7
12-3|x-1|=6
cac ban giup minh nhe nho cac buoc tinh ro rang nha minh se like cho
\(5+x-3=5-\left(x+4\right)\)
\(5+x-3=5-x-4\)
\(x+x=5-4-5+3\)
\(2x=-1\)
\(x=\frac{-1}{2}\)
vay \(x=\frac{-1}{2}\)
\(x-\left(5.\left|-7\right|+3\right)=\left|-8\right|+6-2\)
\(x-\left(5.7+3\right)=8+6-2\)
\(x-38=12\)
\(x=12+38\)
\(x=50\)
vay \(x=50\)
\(\left|x-3\right|+7=0\)
\(\left|x-3\right|=-7\)( ko ton tai)
\(12-3\left|x-1\right|=6\)
\(3\left|x-1\right|=6\)
\(\left|x-1\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x-1=2\\x-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)
vay \(\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)
giup minh 2 cau nay nhe
a 3.(x+5)-8=x+17
b/ 5(x+3)-10=2x-19
giup minh nhe minh bay gio can gap lam mai minh phai nop roi
a) 3(x + 5) - 8 = x + 17
=> 3x + 15 - 8 = x + 17
=> 3x + 7 = x + 17
=> 3x - x = 17 - 7
=> 2x = 10
=> x = 10 : 2
=> x = 5
b) 5(x + 3) - 10 = 2x - 19
=> 5x + 15 - 10 = 2x - 19
=> 5x + 5 = 2x - 19
=> 5x - 2x = -19 - 5
=> 3x = -24
=> x = -24 : 3
=> x = -8
a. 3x+15-8=x+17
3x-x=17-15+8
2x=10
x=5
b.5x+15-10=2x-19
5x+5=2x-19
5x-2x=-19-5
3x=-24
x=-8
thank
dễ lắm kết quả =kimochii
giai phuong trinh:
(5x+5)/(x2-4x+6)+(6x+6)/(x2-5x+7)=17/2
giup mik nha moi nguoi,minh can gap bay gio! thank you! ^_^
1) Tìm stn x biết
a)71.2-6.(2x+5)=105:103
b)(5x+34).68=69.34
c)12:(390:(5.102-(53+x.72)))=4
d)53.(3x+2):13=103:(135:134)
a,71.2-6.(2x+5)=10^5:10^3
142-6.(2x+5)=10^2
142-6.(2x+5)=100
6.(2x+5)=142-100
6.(2x+5)=42
2x+5=42:6
2x+5=7
2x=7-5
2x=2
x=1
Vậy x=1
71.2-6.(2x+5)=105:103 d.125.(3x+2):13=1000:13
142-6.(2x+5)=100 125.(3x+2) = 1000/13.13
6.(2x+5)=142-100 125.(3x+2) =1000
6.(2x+5)=42 3x+2 =1000:125
2x+5 =42:6 3x+2 =8
2x+5 =7 3x=8-2=6
2x =7-5 tự làm phần còn lại
2x =2
x =2:2
x=1
(5x+34).68=69.34
(5x+34).68=29.313
(5x+34)=29.313:68
(5x+81)=2.35
5x=486-81
5x=405
x=81
12:(390:(5.100-(125+x.49)))=4
390:(5.100-(125+x.49))=12:4
390:(5.100-(125+x.49))=3
5.100-(125+x.49)=390:3
500-(125+x.49)=130
125+x.49=500-130
125+x.49=370
x.49=370-125
x.49=245
x=245:49
x=5