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\(16\cdot\frac{x-1}{4}=0\)
\(\Rightarrow\frac{x-1}{4}=0\)
\(\Rightarrow x-1=0\)
\(\Rightarrow x=1\)
vậy_
32(x - 8) = 32
=> x - 8 = 32 : 32
=> x - 8 = 1
=> x = 9
vậy_
112 - (x - 34) = 97
=> x - 34 = 112 - 97
=> x - 34 = 15
=> x = 49
vậy_
181 - (210 - x) = 119
=> 210 - x = 181 - 119
=> 210 - x = 62
=> x = 148
vậy_
\(\left(3x-1\right)\left(x-6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x-1=0\\x-6=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{1}{3}\\x=6\end{cases}}}\)
vậy_
2x = 4
=> 2x = 22
=> x = 2
vậy_
43x = 64
=> 43x = 43
=> 3x = 3
=> x = 1
vậy_
b) 35 x 24 + 35 x 76 +55 x 19 +55 x 91
= 35 x ( 24 + 76 ) + 55 x ( 19 + 91 )
= 35 x100 +55 x 100
= 100 x ( 55 + 35 )
= 90 x 100 =9 000
c) \(6\cdot25\cdot4+4\cdot19\cdot6-2\cdot14\cdot12\)
\(=24\cdot25+24\cdot19-24\cdot14\)
\(=24\left(25+19-14\right)\)
\(=24\cdot30=720\)
d) \(19\cdot64+76\cdot34\)
\(=76\cdot19+76\cdot34\)
\(=76\left(19+34\right)=76\cdot53=4028\)
a) 2 x 16 x 50 x 25
= ( 2 x 50 ) x ( 16 x 25 )
= 100 x 400
= 40 000
a: 3x=81
nên x=27
b: \(5\cdot4^x=80\)
\(\Leftrightarrow4^x=16\)
hay x=2
c: \(2^x=4^5:4^3\)
\(\Leftrightarrow2^x=2^4\)
hay x=4
a. 348 : x = 12
x = 348 : 12
x = 29
b. 9x - 7 = 119
9x = 119 + 7
9x = 126
x = 126 : 9
x = 14
c. 100 - 7 . ( x - 5 ) = 58
7 . ( x - 5 ) = 100 - 58
7 . ( x - 5 ) = 42
x - 5 = 42 : 7
x - 5 = 6
x = 6 + 5
x = 11
d. x không thuộc số tự nhiên
a)348:x=12
x=348:12
x=29
b)9x-7=119
9x=119+7
9x=126
x=126:9
x=14
c)100-7.(x-5)=58
7.(x-5)=100-58
7.(x-5)=42
x-5=42:7
x-5=6
x=6+5
x=11
d)2x-2.23=64
2x-2.8=64
2x-16=64
2x=64+16
2x=80
đề sai
a, 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 93 + 7 )
= 81 x 100
= 8100
a) 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 7 + 93 )
= 81 x 100
= 8100
a) 19 x 64 + 76 x 34 = 19 x 64 + 19 x 4 x 34 = 19 x (64 + 4 x 34) = 19 x 200 = 3800
b) 35 x 12 + 65 x 13 = 35 x 12 + 65 x 12 + 65 = 12 x (35 + 65) + 65 = 12 x 100 + 65 = 1265
c) 136 x 68 + 16 x 272 = 136 x 68 + 16 x 2 x 136 = 136 x (68 + 16 x 2) = 136 x 100 = 13600
a) \(\frac{18^4.3^2.8^3}{27^3.16^2}=\frac{\left(2.3^2\right)^4.3^2.\left(2^3\right)^3}{\left(3^3\right)^3.\left(2^4\right)^2}=\frac{2^4.2^9.3^8.3^2}{3^9.2^8}=\frac{2^{13}.3^{10}}{3^9.2^8}=3.2^5=96\)
b) \(\frac{35^5.9^3.8^5}{81^4.32^5}=\frac{35^5.\left(3^2\right)^3.\left(2^3\right)^5}{\left(3^4\right)^4.\left(2^5\right)^5}=\frac{35^5.3^6.2^{15}}{3^{16}.2^{25}}=\frac{35^5}{3^{10}.2^{10}}=\frac{35^5}{6^{10}}\)
c) \(\frac{48^5.18^2}{81^2.34^4}=\frac{\left(2^4.3\right)^5.\left(2.3^2\right)^2}{\left(3^4\right)^2.\left(2.17\right)^4}=\frac{2^{20}.3^5.2^2.3^4}{3^8.2^4.17^4}=\frac{2^{22}.3^9}{3^8.2^4.17^4}=\frac{2^{18}.3}{17^4}\)
d) \(\frac{54^7.27^3.16^2}{243^2.64^3}=\frac{\left(2.3^3\right)^7.\left(3^3\right)^3.\left(2^4\right)^2}{\left(3^5\right)^2.\left(2^6\right)^3}=\frac{2^7.3^{21}.3^9.2^8}{3^{10}.2^{18}}=\frac{2^{15}.3^{30}}{3^{10}.2^{18}}=\frac{3^{20}}{2^3}\)
a) 2 + (81 - x) = -34
81 - x = -34 - 2
81 - x = -36
x = 81 - (-36)
x = 81 + 36
x = 117
b) (-12).x = 60
x = 60 : (-12)
x = -5
c) 12 : (x - 1)2 = 3
(x - 1)2 = 12 : 3
(x - 1)2 = 4
(x - 1)2 = 22 (cùng số mũ)
⇒ x - 1 = 2
x = 2 + 1
x = 3
2+(81-x)=-34
81-x=(-34)-2
81-x=-36
x=81-(-36)
x= 117
a) 64.x + 34.x = 1930
=> (64 + 34).x = 1930
=> 98.x = 1930
=> x = 1930 : 98 = 965/49
b) 119.x + 81.x = 9751000
=> (119 + 81).x = 9751000
=> 200.x = 9751000
=> x = 9751000 : 200 = 48755
a) 64x + 34x = 1930
<=> 98x = 1930
<=> x= \(\frac{965}{49}\)
b) 119x + 81 x = 9751000
<=> 200x = 9751000
<=> x= 48755