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\(4x^3+15=47\)
\(\Leftrightarrow4x^3=32\)
\(\Leftrightarrow x^3=8\)
\(\Leftrightarrow x=2\)
\(4\cdot2^x-3=125\)
\(\Leftrightarrow4\cdot2^x=128\)
\(\Leftrightarrow2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
4x3 + 15 = 47
=> 4x3 = 47 - 15 = 32
=> x3 = 32 : 4 = 8 = 23
=> x = 2
4.2x - 3 = 125
=> 4.2x = 125 + 3 = 128
=> 2x = 128 : 4 = 32 = 25
=>x = 5
a, 1230 : 3(x – 20) = 10
3(x – 20) = 123
x – 20 = 41
x = 61
b, 250 – 10.(24 – 3x):15 = 244
10.(24 – 3x):15 = 6
10.(24 – 3x) = 90
24 – 3x = 9
3x = 15
x = 5
c, 4 x 3 + 15 = 47
4 x 3 = 32
x 3 = 8 = 2 3
x = 2
d, 65 - 4 x + 2 = 2014 0
65 - 4 x + 2 = 1
4 x + 2 = 64 = 4 3
x + 2 = 3
x = 1
e, 4 . 2 x - 3 = 125
4 . 2 x = 128
2 x = 32 = 2 5
x = 5
\(4x^3+15=47\)
\(\Leftrightarrow4x^3=32\)
\(\Leftrightarrow x^3=8\)
\(\Leftrightarrow x^3=2^3\)
\(\Leftrightarrow x=2\)
\(4.2^x-3=125\)
\(\Leftrightarrow4.2^x=128\)
\(\Leftrightarrow2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
a) 4x3+15=47
=> 4x3=47-15
=> 4x3=32
=> x3=32:4
=> x3=23
=> x=2
b) 4.2x-3=125
=> 4.2x=125+3
=> 2x=128:4
=> 2x=32
=> 2x=25
=> x=5
4x3 + 15 = 47
4x3 = 47 - 15
4x3 = 32
x3 = 32 : 4
x3 = 8
x3 = 23
x = 2
b) 4 . 2x - 3 = 125
4 . 2x = 125 + 3
4 . 2x = 128
2x = 128 : 4
2x = 32
2x = 25
x = 5
a)4x3+15=47
4x3=47-15
4x3=32
x3=32:4
x3=8
x3=23
vậy x = 2
b)4.2x-3=125
4.2x=125+3
4.2x=128
2x=128:4
2x=32
2x=25
Vậy x=5
a) 4x3 + 15 = 47 b) 4.2x - 3 = 125
4x3 = 47 - 15 4.2x = 125 + 3
4x3 = 32 4.2x = 128
x3 = 32 : 4 2x = 128 : 4
x3 = 8 2x = 32
x3 = 23 2x = 25
=> x = 2 => x = 5
\(4x^3+15=47\)
\(4x^3=47-15\)
\(4x^3=32\)
\(x^3=32:4\)
\(x^3=8\)
\(x^3=2^3\)
\(\Rightarrow x=2\)
\(4.2^x-3=125\)
\(4.2^x=125+3\)
\(4.2^x=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
\(4x^3+15=47\)
\(4x^3=47-15\)
\(4x^3=32\)
\(x^3=32:4\)
\(x^3=8\)
\(x^3=2^3\)
\(\Rightarrow x=2\)
\(4.2^x-3=125\)
\(4.2^x=125+3\)
\(4.2^x=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
\(3^3=27;3^6=729\)
\(\left(8X-12\right):4=729:27\)
\(\left(8X-12\right):4=27\)
\(8X-12=27.4\)
\(8X-12=108\)
\(8X=108+12\)
\(8X=120\)
\(X=120:8\)
\(X=15\)
-[(8x - 12):4] .33=36
[(8x - 12):4] = 36:33
[(8x - 12):4] = 33
(8x - 12):4 = 27
8x - 12 = 27 x 4
8x - 12 = 108
8x = 108 + 12
8x = 120
x = 120 : 8
x = 15
-4x3+15=47
4x3 = 47-15
4x3 = 32
x3 = 32:4
x3 = 8
x = 2
-4.2x-3=125
4.2x = 125 + 3
4.2x = 128
2x = 128:4
2x = 32
x = 32:2
x = 16
1.a) 4.(12+88) = 4.100=400
b)72- 6 .[2.8:8 ]=72-6.[16:8]=72-6 .2= 49-12=37 ( tui ko chắc lắm )
2.a) x=26-11=15
b) (4x-15)3=53
4x-15=5
4x= 5+15
4x=20
vậy x = 20
Bài 2:
a: Ta có: x+11=26
nên x=15
b: Ta có: \(\left(4x-15\right)^3=125\)
\(\Leftrightarrow4x-15=5\)
hay x=5
\(\left(4x-15\right)^3=125\)
\(\left(4x-15\right)^3=5^3\)
\(4x-15=5\)
\(4x=20\)
\(x=5\)
\(\left(4x-15\right)^3=125\)
\(\left(4x-15\right)^3=5^3\)
\(=>4x-15=5\)
\(4x=5+15\)
\(4x=20\)
\(x=20:4\)
\(x=5\)