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\(a)24\times(x-16)=12^2\\\Rightarrow 24\times(x-16)=144\\\Rightarrow x-16=144:24\\\Rightarrow x-16=6\\\Rightarrow x=6+16\\\Rightarrow x=22\\---\\b)(x^2-10):5=5\\\Rightarrow x^2-10=5\times5\\\Rightarrow x^2-10=25\\\Rightarrow x^2=25+10\\\Rightarrow x^2=35\\\Rightarrow x=\pm\sqrt{35}\\---\)
\(c)(5x+335):2=400\\\Rightarrow 5x+335=400\times2\\\Rightarrow 5x+335=800\\\Rightarrow 5x=800-335\\\Rightarrow 5x=465\\\Rightarrow x=465:5\\\Rightarrow x=93\\---\\d)63:(5x+4)=2^3-1\\\Rightarrow 63:(5x+4)=8-1\\\Rightarrow 63:(5x+4)=7\\\Rightarrow 5x+4=63:7\\\Rightarrow 5x+4=9\\\Rightarrow 5x=9-4\\\Rightarrow 5x=5\\\Rightarrow x=5:5\)
\(\Rightarrow x=1\)
\(Toru\)
1. a) 4.415.8.25.125
= (4.25). (8.125).415
= 100.1000.415
= 100000.415
= 41500000
b) 2.31.12+4.42.6+8.27.3
= (2.31.12)+(4.42.6)+(8.27.3)
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24 (31+42+27)
= 24.100
= 2400
a) \(B=5+5^2+5^3+...+5^{2022}\)
\(\Rightarrow5B=5^2+5^3+5^4+...+5^{2023}\)
\(\Rightarrow4B=5^{2023}-5\)
b) \(4B+5=5^X\)
Hay \(5^{2023}-5+5=5^X\)
\(5^{2023}=5^x\)
\(\Rightarrow x=2023\)
B = 5 + 52 + 53 +...+ 52022
5.B = 52 + 53 +....+ 52023
5B- B = 52023 - 5
4B = 52023 - 5
b, 4B + 5 = 5\(^x\) ⇒ 52023 - 5 + 5 = 5\(^x\)
5\(^{2023}\) = 5\(x\)
\(x\) = 2023
Bài 1: a, 73.74 + 73 + 73.65
= 73.( 74 + 1 + 65)
= 73. 140 = 10220
b, (-45) +(-35) = - ( 35 + 45) = 80
c, 299 - 6.[ (12 + 2): 5 - 3]
299 - 6.(2,8 - 3)
299 - 6.(-0,2)
299 + 1,2
= 300,2
Bài 2:
a, \(x-5\) = -15
\(x\) = -15 + 5
\(x\) = -10
b, 5\(x\) - 2.5 = 20.(-2)
5\(x\) - 10 = -40
5\(x\) = -40 + 10
5\(x\) = - 30
\(x\) = - 6
c, 15 - \(x\) = -3.4
15 - \(x\) = -12
\(x\) = 15 - ( -12)
\(x\) = 27
a) (5x + 335) : 2 = 400
5x + 335 = 400 . 2
5x + 335 = 800
5x = 800 - 335
5x = 465
x = 465 : 5
x = 93
b) 63 : (5x + 4) = 2^3 - 1
63 : (5x + 4) = 8 -1
63 : (5x + 4) = 7
5x + 4 = 63 : 7
5x + 4 = 9
5x = 9 - 4
5x = 5
x = 5 :5
x = .....
c) x^2 - 10) : 5 = 3
x ^2 - 10 = 3 . 5
x^2 - 10 = 15
x^2 = 15 + 10
x^2 = 25
x^2 = 5^2
x = 2
cái dấu ^ là mũ nha, nếu bt r thì thôi
cho mk hỏi bạn Nguyễn Thùy Dương bạn coi câu trả lời 5x + 4 = 63 :7 5x + 4 = ....... đúng ko ^-^