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1)
a) 2x + 5 = 3⁴ : 3²
2x + 5 = 3²
2x + 5 = 9
2x = 9 - 5
2x = 4
x = 4 : 2
x = 2
b) (3x - 24).73 = 2.74
(3x - 24).73 = 148
3x - 24 = 148/73
3x = 148/73 + 24
3x = 1900/73
x = 1900/73 : 3
x = 1900/219
c) [3.(42 - x)] + 15 = 23.3
126 - 3x + 15 = 69
141 - 3x = 69
3x = 141 - 69
3x = 72
x = 72 : 3
x = 24
d) 126 + (132 - x) = 300
132 - x = 300 - 126
132 - x = 174
x = 132 - 174
x = -42
2)
a) 120 - (x + 55) = 60
x + 55 = 120 - 60
x + 155 = 60
x = 60 - 55
x = 5
b) (7x - 11).3 = 25.52 + 200
(7x - 11).3 = 1500
7x - 11 = 1500 : 3
7x - 11 = 500
7x = 500 + 11
7x = 511
x = 511 : 7
x = 73
c) 2x + 2x + 4 = 544
4x = 544 - 4
4x = 540
x = 540 : 4
x = 135
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a, =25- 62-25 +12
= (25-25)+12-62
= -50
b, = -24 -68+24 + 2. (-60)
= (-24+24)-68 + -120
= -188
c,
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a) (-25) + (-65) + (-23) + 21
= [(-25) + (-65)] + [(-23) + 21]
= (-90) + (-2)
= -92
b) (-32) + 34
= 2
c) |-3| + (-56) + (-34) + 14
= 3 + (-56) + (-34) + 14
= [ 3 + (-56)] + [(-34) + 14]
= (-53) + (-20)
= -73
a) (-25) + (-65) + (-23) + 21
= [(-25) + (-65)] + [(-23) + 21]
= (-90) + (-2)
= -92
Vậy...
b) (-32) + 34
= 2
Vậy...
c) |-3| + (-56) + (-34) + 14
= 3 + (-56) + (-34) + 14
= [ 3 + (-56)] + [(-34) + 14]
= (-53) + (-20)
= -73
Vậy...
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a) 25 + 75 + 32 - 32 - 75
= (75-75) + (32-32) + 25
= 25
b) 34 . 15 - 34 . 10 - 15 . 34 - 15 . -10
= -10 . (34+15) - 15 (-34+34)
=-490
a) 25 + 75 + 32 - 32 - 75
= (75-75) + (32-32) + 25
= 25
b) 34 . 15 - 34 . 10 - 15 . 34 - 15 . -10
= -10 . (34+15) - 15 (-34+34)
=-490
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a. ( - 57 ) . ( 67 - 34 ) - 67 . (34 -57 )
= - 57 . 67 - ( - 57 ) . 34 - 67 . 34 - 67 . 57
= 57 . ( 67 - 67 ) + 34 . ( 67 - 57 )
= 57 . 0 + 34 . 10
= 0 + 340
= 340
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a: \(\left\{100:\left[45-45:\left(-9\right)\right]-32\right\}\cdot5-2\cdot5^2\)
\(=\left\{100:\left[45+5\right]-32\right\}\cdot5-2\cdot25\)
\(=\left\{100:50-32\right\}\cdot5-50\)
\(=\left(-30\right)\cdot5-50\)
=-150-50
=-200
b: \(\left(25-16-3^2\right)\cdot2024\)
\(=\left(9-9\right)\cdot2024\)
\(=0\cdot2024=0\)
c: \(\left(34-42-2023\right)\cdot128^0\)
\(=34-42-2023\)
=-8-2023
=-2031
34 25 100
=81.32.100
=259200
35 -200-32 .3
=243-200-9.3
=16
\(3^4\cdot2^5\cdot100=81\cdot32\cdot100=\left(81\cdot32\right)\cdot100\)
\(=2592\cdot100=259200\)
\(3^5-200-3^2\cdot3=3^5-200-\left(3^2\cdot3\right)\)
\(=3^5-200-3^{2+1}=3^5-200-3^3\)
\(=\left(3^5-3^3\right)-200=\left(243-27\right)-200\)
\(=216-200=16\)