Tìm x biết:
2 x X +68 = 126
3 x X -24 = 90
84 - 4 x X =16
(5 x X + 10 ) + 35 = 70
(6 x X - 18) - 42 =12
( 2 x X - 4 ) + 24
45 - ( 3 x X - 9 ) = 15
60 + (10 x X - 40 ) = 90
145 - (5 x X + 15 ) = 65
84 - ( 2 x X - 8 ) = 46
Tính nhanh \(A=\frac{1+2^3+2^6+...+2^{81}+2^{84}+2^{87}}{1+2^5+2^{10}+...+2^{75}+2^{80}+2^{85}}\)
Bài 1: Tìm x thuộc Q, biết
1, \(\frac{x+1}{2}+\frac{x+1}{3}+\frac{x+1}{4}=\frac{x+1}{5}+\frac{x+1}{6}\)
2,\(\frac{x+1}{2009}+\frac{x+2}{2008}+\frac{x+3}{2007}=\frac{x+10}{2000}+\frac{x+11}{1999}+\frac{x+12}{1998}\)
3, \(\frac{x-90}{10}+\frac{x-85}{15}=\frac{x-80}{20}+\frac{x-75}{25}\)
4,\(\frac{x+3}{7}+\frac{x+2}{8}+\frac{x+1}{9}=-3\)
CÁC BN GIÚP MK NHA AI NHANH MK TICK CHO THANKS
( 5 + 2*x) + (10+6*x)+ (20+ 18*x) + ( 40+ 54 *x) + (80+162*x)+(160+ 486*x) = 177 Tìm x, biết
Tìm x:
a) 311 - x + 82 =46 + (x-21)
b) (-x + 821 + 534) = 499 + (x - 84)
c) -(x -3 + 85) =( x + 70 -71 ) - 5
LÀM NHANH GÚP MK NHA
tìm x biết
1) x=-1/2 + 3/4 2) x - 1/5 = 2/11 3) x - 5/6 = 16/42 + -8/56
4) x/5 = 5/6 + -19/30 5) |x| - 1/4 = 6/18 6)x = -1/2 +3/4
7) x/15 = 3/5 + -2/3 8)11/8 + 13/6 = 85/x 9) x - 7/8 = 13/12
10) x - -6/15 = 4/27 11) -\(\dfrac{-6}{12}\)+ x = 9/48 12) x - 4/6 = 5/25 + -7/15
tìm x;y
a ) |x-1|+|x+5|=6
b)(2x-y+3)4+|y+2|=0
c)|3-x|+|x+5|=80 /(y-2)2+10
Giups mk với!!!
Bài 1:Tìm x,y biết:
a.\((x-\frac{2}{5})^{2010}+(y+\frac{3}{7})^{468}\le0\)
b.\((x+0,7)^{84}+(y-6,3)^{262}\le0\)
c.\((x-5)^{88}+(x+y+3)^{496}\le0\)
Bài 2: Tìm số nguyên dương x,y biết:
\(2^x-2^y=224\)
x + 25 = 5/6(85 - x)