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43 - ( 5 - 2 )2 + 150
= 64 - 32 + 1
= 64 - 9 + 1
= 55 + 1
= 56
k đúng cho mình nha !
-Học tốt-
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( 3x - 17 ) . 16 = \(4^3\)<=> ( 3x - 17 ) . 16 = 64
<=> 3x - 17 = 64 : 16
<=> 3x = 4 + 17
<=> x = 21 : 3
<=> x = 7
(3X-17).16=43
(3X-17).16=64
(3X-17)=64:16
3X-17=4
3X=4+17
3X=21
X=21:3
X=7
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
4 mũ 3=4.4.4=64;8 mũ 2=8.8=64
Bởi vì 64=64 nên suy ra 4 mũ 3= 8 mũ 2
![](https://rs.olm.vn/images/avt/0.png?1311)
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a)\(\left(5^{23}.5^{18}\right):5^{39}-5^0.0^5\)
= \(5^{41}:5^{39}-1.0\)
= \(5^2-0\)
= \(25-0=25\)
b)\(\left[2.3^3+144:\left(7^2-925:5^2\right)\right].\left|-8\right|\)
= \(\left[2.27+144:\left(49-925:25\right)\right].8\)
= \(\left[54+144:\left(49-37\right)\right].8\)
= \(\left[54+144:12\right].8\)
= \(\left[54+12\right].8\)
= \(66.8\)
= 528
![](https://rs.olm.vn/images/avt/0.png?1311)
(12x - 43) . 83 = 4 . 84
(12x - 64) . 512 = 4 . 4096
(12x - 64) . 512 = 16 384
(12x - 64) = 16 384 : 512
(12x - 64) = 32
12x = 32 + 64
12x = 96
x = 96 : 12
x = 8
(12x - 43) . 83 = 4 . 84
(12x - 64) . 512 = 4 . 4096
(12x - 64) . 512 = 16 384
(12x - 64) = 16 384 : 512
(12x - 64) = 32
12x = 32 + 64
12x = 96
x = 96 : 12
x = 8
![](https://rs.olm.vn/images/avt/0.png?1311)
2.32 - 43 : (-16.2)
= 2.9 - 64 : (-32)
= 18 - (-2)
= 18 + 2
= 20
\(2.3^2-4^3:\left(-16.2\right)\)
\(=2.9-64:\left(-32\right)\)
\(=18-\left(-2\right)=18+2=20\)