230 + [24 + (x - 5)] = 315. 20180 ;
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a, 36:(x–5) = 2 2
(x–5) = 9
x = 14
b, [3.(70–x)+5]:2 = 46
[3.(70–x)+5] = 92
70–x = 29
x = 41
c, 450:[41–(2x–5)] = 3 2 .5
41–(2x–5) = 10
2x–5 = 31
2x = 36
x = 18
d, 230+[ 2 4 +(x–5)] = 315. 2018 0
16+(x–5) = 315–230
x–5 = 85–16
x = 69+5
x = 74
e, 2 x + 2 x + 1 = 48
2 x .(2+1) = 48
2 x = 16 = 2 4
x = 4
f, 3 x + 2 + 3 x = 2430
3 x . 3 2 + 1 = 2430
3 x = 2430:10 = 243 = 3 5
x = 5
a, 15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0
= 15.{32:[1+15]+3}–1
= 15.5–1
= 74
b, 25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }
= 25.{128:[8+4.2]–16}
= 25.24
= 600
c, 2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }
= 2019.{101–1000:[(32+125–36):11–1]}
= 2019.{101–1000:[121:11–1]}
= 2019.{101–1000:10}
= 2019.1
= 2019
230 + [2² + (x - 5)²] = 315 . 2021⁰
230 + 4 + (x - 5)² = 315.1
234 + (x - 5)² = 315
(x - 5)² = 315 - 234
(x - 5)² = 81
x - 5 = 9 hoặc x - 5 = -9
*) x - 5 = 9
x = 9 + 5
x = 14
*) x - 5 = -9
x = -9 + 5
x = -4
Vậy x = -4; x = 14
a,
13[x-9] = 169
=> x - 9 = 169/13
=> x - 9 = 13
=> x = 13+9
=> x = 22
b,
Viết lại đề:
7x+3 = 343
<=> 7x+3 = 73
=> x + 3 = 3
=> x = 3-3
=> x = 0
c,
230 + [16 + [x-5]] = 315 . 23
=> 230 + [16 + x - 5] = 315 . 8
=> 230 + 16 + x - 5 = 2520
=> 230 + 16 + x = 2520 + 5 = 2525
=> x = 2525 - 230 - 16 = 2279
d,
13.x - 32.x = 20171 - 12018
=> 13x - 9x = 2017 - 1
=> 4x = 2016
=> x = 504
a) 13 ( x-9 )=169
=> x-9 =169 : 13 =13
=> x=13+9 =22
b)\(7^{x+3}=343\)
\(7^x.7^3=343\)
\(7^x=343:7^3\)
\(7^x=1\Rightarrow x=1\)
c)230 + 16 +x -5 =315.8
241 +x =2520
x=2520-241=2279
d) 13x -\(3^2.x\)=2017-1
x(13-9)=2016
x.4=2016
x=2016:4
x=504
a/ 525.5:225+|-125|
=525.5:225+125
=525.51:225+53
=525+1-25+3
=54
b/232:[315-(230+8)]
=232:[315-230-8]
=232:77
= phần b đề sai
c/(-1732)+7376-(-1998)+(-2546)
=-1732+7376+1998-2546
=7642-2546
=5096.
a ) 525 . 5 : 525 + l - 125 l
= 525 . 51 : 525 + 125
= 525+1-25+3
= 54
x - (40 - 67) = 2018⁰
x - (-27) = 1
x + 27 = 1
x = 1 - 27
x = -26
\(x\) - (40 - 67) = 20180
\(x\) + (67 - 40) = 1
\(x\) + 27 = 1
\(x\) = 1 - 27
\(x\) = - 26
\(=-\dfrac{8}{5}\left|-\dfrac{3}{4}\right|+1=-\dfrac{8}{5}\cdot\dfrac{3}{4}+1=-\dfrac{6}{5}+1=-\dfrac{1}{5}\)