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-4.|x-1| + (1/2-2,5)2 = -3
-4.|x-1| + (-2)2 = -3
-4.|x-1| + 4 = -3
-4.|x-1| = -3 - 4
-4.|x-1| = -7
|x-1| = (-7) : (-4)
|x-1| = 7/4
TH1: x - 1 = 7/4 => x = 7/4 + 1 = 11/4
TH2: 1 - x = 7/4 => x = 1 - 7/4 = -3/4
Vậy x = {11/4; -3/4}
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\(\frac{a}{1}=\frac{b}{2}=\frac{c}{3}=\frac{5a}{5}=\frac{2b}{4}=\frac{8c}{24}=\frac{5a+2b+8c}{5+4+24}\)(*)
\(\frac{a}{1}=\frac{b}{2}=\frac{c}{3}=\frac{-3a}{-3}=\frac{-4b}{-8}=\frac{6c}{18}=\frac{-3a-4b+6c}{-3-8+18}\)(**)
Lấy (*) chia cho (**) được kết quả: A=\(\frac{7}{33}\)
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\(\frac{11}{12}-\frac{2}{3}|x|=\frac{3}{8}\)
\(\Rightarrow\frac{-2}{3}|x|=\frac{3}{8}-\frac{11}{12}\)
\(-\frac{2}{3}|x|=-\frac{13}{24}\)
\(|x|=\frac{13}{16}\)
\(\Rightarrow x=\hept{\begin{cases}\frac{13}{16}\\-\frac{13}{16}\end{cases}}\)
=.= hok tốt!!
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a, 7/12 - 3/4 . 5/6
= 7/12 - 5/8
= 14/24- 15/24
= -1/24
b,( 2/1/3 + 1/3/4 ) . 12/13
= ( 6/3 + 7/3 ) . 12/13
= 13/3 . 12/13
=4
c, 12 : ( 3/4 -5/6 ) . 2
= 12 : ( -1/12 ) .2
= 12 . -12 . 2
= -228
d, 7/22 : 3/11 + 7/22 : 4/11
= 7/22 . 11/3 + 7/22 . 11/4
= 7/22 . ( 11/3 + 11/4 )
....
tiếp theo bạn tự làm nhé!
A= 1+2+2^2+2^3+.....+2^65
=>2A=2+2^2+2^3+2^4.....+2^66
=>2A-A=(2+2^2+2^3+2^4.....+2^66)-(1+2+2^2+2^3+....+2^65)
=>A=2^66-1
A = 1 + 2 + 22 + 23 + ... + 265
2 . A = 2 . ( 1 + 2 + 22 + 23 + ... + 265 )
2A = 2 + 22 + 23 + ... + 265 + 266
2A - A = ( 2 + 22 + 23 + ... + 265 + 266 ) - ( 1 + 2 + 22 + 23 + ... + 265 )
A = 266 - 1