tính
2x-2^3.3^2=138
(6x-3^4).7^3=3.7^4
tính
2x-2^3.3^2=138
(6x-3^4).7^3=3.7^4
2x - 23. 33 = 138
2x - 8 . 27 = 138
2x - 216 = 138
2x = 138 + 216
2x = 354
2x = 354 : 2
x = 177
vậy x = 177
( 6x - 34 ) . 73 = 3 . 74
( 6x - 81 ) . 343 = 3 . 2401
( 6x - 81 ) . 343 = 7203
6x - 81 = 7203 : 343
6x - 81 = 21
6x = 21 + 81
6x = 102
x = 102 : 6
x = 17
vậy x = 17
tim x
a,2x-138=2^3.3^2
b,20-[7.(x-3)+4]=2
c,[6x-39]*3.28=5628
a)2x-138=23.32
=>2x-138=72
=>2x =72+138
=>2x =210
=>x =210:2
=>x =105
b)20-[7(x-3)+4]=2
=>7(x-3)+4 =20-2
=>7(x-3)+4 =18
=>7(x-3) =18-4
=>7(x-3) =14
=>x-3 =14:7
=>x-3 =2
=>x =2+3
=>x =5
c)[6x-39].3.28=5628
=>[6x-39].3 =5628:28
=>[6x-39].3 =201
=>6x-39 =201:3
=>6x-39 =67
=>6x =67+39
=>6x =106
=>x =106:6
=>x =17,6
a) \(2x-138=2^2.3^2\)
\(2x-138=4.9\)
\(2x-138=36\)
\(2x=36+138\)
\(2x=174\)
\(x=174:2\)
\(x=87\)
Vậy \(x=87\)
b) \(20-\left[7.\left(x+3\right)+4\right]=2\)
\(\left[7.\left(x+3\right)+4\right]=20-2\)
\(7.\left(x+3\right)+4=18\)
\(7.\left(x+3\right)=18-4\)
\(7.\left(x+3\right)=14\)
\(\left(x+3\right)=14:7\)
\(x+3=2\)
\(x=2-3\)
\(x=-1\)
Vậy \(x=-1\)
c) \(\left[6x-39\right].3.28=5628\)
\(\left[6x-39\right].84=5628\)
\(\left[6x-39\right]=5628:84\)
\(6x-39=67\)
\(6x=67+39\)
\(6x=106\)
\(x=106:6\)
\(x=\frac{53}{3}\)
Vậy \(x=\frac{53}{3}\)
Chúc bạn học tốt !!!
tính giá trị
a,\(\dfrac{\left(-3\right)^7.2^8}{6^7}\)
b,\(\dfrac{-3.7^4+7^3}{7^5.6-7^3.2}\)
c,\(\dfrac{5^3.3^5}{5^3.0.5+125.2.5}\)
a) \(\dfrac{\left(-3\right)^7\cdot2^8}{6^7}\)
\(=\dfrac{-1\cdot3^7\cdot2^8}{\left(2\cdot3\right)^7}=\dfrac{-1\cdot3^7\cdot2^7\cdot2}{2^7\cdot3^7}=-1\cdot2=-2\)
b) \(\dfrac{-3\cdot7^4+7^3}{7^5\cdot6-7^3\cdot2}\)
\(=\dfrac{-3\cdot7\cdot7^3+7^3}{7^3\cdot7^2\cdot6-7^3\cdot2}\)
\(=\dfrac{7^3\left(-3\cdot7+1\right)}{7^3\left(7^2\cdot6-2\right)}=\dfrac{-3\cdot7+1}{7^2\cdot6-2}\)
\(=\dfrac{-21+1}{294-2}=\dfrac{-20}{290}=\dfrac{-2}{29}\)
b) \(\dfrac{5^3\cdot3^5}{5^3\cdot0,5+125\cdot2\cdot5}\)
\(=\dfrac{5^3\cdot3^5}{5^3\cdot0,5+5^3\cdot2\cdot5}=\dfrac{5^3\cdot3^5}{5^3\left(0,5+2\cdot5\right)}\)
\(=\dfrac{3^5}{0,5+2\cdot5}=\dfrac{243}{10,5}=\dfrac{162}{7}\)
Tìm x
A) 2.x-23.32=138
B) (6.x-34).73=3.74
Ta có : (6x - 34) . 73 = 3.74
=> (6x - 34) = 3.7
=> (6x - 34) = 21
=> 6x - 81 = 21
=> 6x = 102
=> x = 17
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Ta thực hiện nhân trước 2.x-23.32=138 2.x-8.9=138 2.x-72=138 x=138+72 x=210 x=210:2 x=105
Tìm xA) 2.x-23.32=138
B) (6.x-34).73=3.74
2x - 23.32 = 138
2x - 72 = 138
2x = 138 + 72
2x = 200
x = 200 ÷ 2
x = 100
( 6.x - 34 ).73= 3.74
( 6x - 34 ).343 = 7203
6x - 34 = 7203 ÷ 343
6x - 34 = 21
6x = 21 + 34
6x = 55
x = 55 ÷ 6
x = 55/6
a,2x-23.32=138
2x-72=138
2x=66
x=66:2
x=33
Vậy x=33
b,(6x-34).73=3.74
(6x-34).343=7203
6x-34=21
6x=21+34
6x=55
x=55:6
x=\(\frac{55}{6}\)
Vậy x=\(\frac{55}{6}\)
a)27+(220-6x).3=615
b)315-(x-3).7=210
c)1302-(2x+421)=503
d)609(5x)=12
e)3.72x-4-2=72x-4
f)32x.3x+1=81
\(27+\left(220-6x\right).3=615\)
\(\rightarrow\left(220-6x\right).3=615-27=588\)
\(\rightarrow220-6x=588:3=196\)
\(\rightarrow6x=220-196=24\)
\(\rightarrow x=24:6=4\)
\(315-\left(x-3\right).7=210\)
\(\Rightarrow\left(x-3\right).7=315-210=105\)
\(\Rightarrow x-3=105:7=15\)
\(\Rightarrow x=15+3=18\)
Trả lời
a)27+(220-6x)3=615
(220-6x)3=615-27
(220-6x)3=588
220-6x =588:3
220-6x =196
6x =220-196
6x =24
=>x =24:6
=>x =4
b)315-(x-3)7=210
(x-3)7=315-210
(x-3)7 =105
x-3 =105:7
x-3 =15
x =15+3
x =18
c)1302-(2x+421)=503
2x+421 =1302-503
2x+421 =799
2x =799-421
2x =378
x =378:2
x =189
d)609(5x)=12
5x =609:12
5x =50,75
x =10,15
a) 1+2+3+...+x=500500
b) 2x-2 mũ 3 ×3 mũ 2 = 138
c) (6x-3 mũ 4 ) ×7 mũ 3=3×7 mũ 4
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Lác đác đằng sau chiếc chổi chà
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Phen này nhất quyết thuê cây kiếm
Trở về chém ổng đứt làm ba
Tìm x
A) 2.x-23.32=138
B) (6.x-34).73=3.72
a) \(2x-2^3.3^2=138\)
\(\Rightarrow2x=138+2^3.3^2\)
\(\Rightarrow2x=210\)
\(\Rightarrow x=105\)
Vậy x = 105.
a)2x-96=138
2x=174
x=87
b)(6x-81).343=147
2058x-27783=147
2058x=27930
x=13,57
Tìm x , biết
a) 2.x-138=2^3.3^2
b) ( 3.x-2^4) .7^2=2.7^4
a ) 2x - 138 = 2 ^ 3 . 3 ^ 2
2x - 138 = 8 . 9
2x - 138 = 72
2x = 210
x = 105
b ) ( 3x - 2 ^ 4 ) . 7 ^ 2 = 2 . 7 ^ 4
( 3x - 16 ) . 49 = 4802
( 3x - 16 ) = 98
3x = 114
x = 38