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https://hoc24.vn/cau-hoi/a-5x-2x-62-50b-5x-x-150-2-3c-6x-x-511-59-31d-5x-3x-36-334-124x-2x-68-219-216.2785429565572
a: \(\Leftrightarrow7x=35\)
hay x=5
b: \(\Leftrightarrow6x=78\)
hay x=13
1: =>\(5^{x-2}-9=2^4-\left(6^2-6^2\right)\)
=>\(5^{x-2}=16+9=25\)
=>x-2=2
=>x=4
2: \(\Leftrightarrow3^x+16=19^6:19^5-3=19-3=16\)
=>3^x=0
=>x=0
3: \(\Leftrightarrow2^x+2^x\cdot16=272\)
=>2^x*17=272
=>2^x=16
=>x=4
4: \(\Leftrightarrow2^{x-1}+3=24-\left(4^2-2^2+1\right)=24-\left(16-4+1\right)\)
=>\(2^{x-1}+3=24-16+4-1=8+4-1=12-1=11\)
=>2^x-1=8
=>x-1=3
=>x=4
a: \(\Leftrightarrow6x=30\)
hay x=5
b: \(\Leftrightarrow6x=25+12-1=36\)
hay x=6
a: \(\Leftrightarrow8x=108+12=120\)
hay x=15
b: \(\Leftrightarrow6x=60\)
hay x=10
25 + 68 : ( 5x + 7 ) = 29
68 : ( 5x + 7 ) = 29 - 25
68 : ( 5x + 7 ) = 4
5x + 7 = 68 : 4
5x + 7 = 17
5x = 17 - 7
5x = 10
x = 10 : 5
x = 2
1,7x=5^2+3
7x=28
x=28:7
x=4
mấy câu còn lại tương tự như vậy thôi,5x+3x=8x;4x+2x=6x;5x+x=6x
a/\(450:\left(x-19\right)=50\)
=>\(x-19=9\)
=>\(x=28\)
Vậy...
b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)
\(9\left(x+4\right)=20x+25\)
\(20x+25=9x-36\)
\(11x=-61\)
\(x=-\dfrac{61}{11}\)
Vậy..
c/Tương tự
d/Tương tự
25.3-x=104
75-x=104
x=75-104
x=-29
3(5x-15)-52=68
3(5x-15)=68+52
3(5x-15)=120
5x-15=120:3
5x-15=40
5x=40+15
5x=55
x=55:5
x=11
5(x+35)=515
x+35=515:5
x+35=103
x=103-35
x=68
tìm x biết
\(\dfrac{2x}{68}\)=\(\dfrac{16}{32}\)
\(\Leftrightarrow\dfrac{x}{34}=\dfrac{1}{2}\)
\(\Leftrightarrow2x=1.34\)
\(\Leftrightarrow x=17\)
b)\(\dfrac{5x}{100}=\dfrac{105}{25}\)
\(\Leftrightarrow\dfrac{x}{20}=\dfrac{21}{5}\)
\(\Leftrightarrow5x=420\)
\(\Leftrightarrow x=84\)
5x + 68 : 4 = 237
5x + 68 = 237 x 4
5x + 68 = 948
5x = 948 - 68
5x = 880
x = 176
~ HT ~
5x +68 :4=237
5x + 68 =237 x 4=948
5x =948- 68=860
x =860 : 5
x =172
Hok tốt!