a, 3 - (-6/7)\(^0\) + (1/2) \(^2\) :2
= 3 - 1 + 1/4 : 2
= 3 - 1 + 1/8
= 2 + 1/8 = 17/8
a, 3 - (-6/7)\(^0\) + (1/2) \(^2\) :2
= 3 - 1 + 1/4 : 2
= 3 - 1 + 1/8
= 2 + 1/8 = 17/8
1) 5/7.37 13/23-51 13/23.5/7
2) -2/3 +1/3+0,5+2 1/2
3)-0,5+2/3+1/2
4) (8+2 1/3-3/5) -(5+0,4)-(3 1/2 -2)
5) (2/9-7/12):3/4+(16/9-5/12):3/4
6) -(2021.0,7+19,75) +0,7- (8-19,75)
7)15/34+7/21+19/34-20/15
8) 2 5/6+1/6:(-5/8)
9) (-2)^2 +2/9. (4/5-2/3)
10) (-1/5+3/7):5/4+(-4/5+4/7):5/4
11) 2022,2021 . 1954,1945+ 2022,2021 . (-1954,1945)
12) -5,2 .72 +69,1 +5,2 . (-28)+(-1,1)
13) (7 -1/2-3/4) : (5-1/4-5/8)
14) (8+ 2 1/3 -3/5) -(5+0,4) -( 3 1/3 - 2)
a ) 5x+1 . 3y-1 = 152+x
b ) 62x / 3x+2 - 2y = 0
c ) x8 + 3x2 = 0
d ) ( x - 7 )x+1 = ( x - 7 )x+11
Bài 2.
Tìm m,n thuộc N
2m - 2n = 256
TÌM THƯƠNG A/B
A= 9/1 + 8/2 + 7/3 + 6/4 + 5/5 + 4/6 + 3/7 + 2/8 + 1/9
B=1/2 + 1/3 + 1/4 + 1/5 + 1/6 + 1/7 + 1/8 + 1/9 + 1/10
HELP ME
Chứng minh rằng : \(A=\dfrac{3}{1^2.2^2}+\dfrac{5}{2^2.3^2}+\dfrac{7}{3^2.4^2}+...+\dfrac{19}{9^2.10^2}< 1\)
Tìm x,biết
1) 1 7/9:2 2/3=2 2/3:x
2)1 2/3:x/4=6:0,3.
3) x-3/x-2=4/7
4) |x|+3,5=0
5)|x+1/3|-4=1
Bài 1. Rút gọn
B = 1-7+72-73+...-799
D = 1/3 - 1/32 + 1/33 - 1/34 +...- 1/360
Bài 2. So sánh
A = 1+6+62+...+69 / 1+6+62+...+68
B = 1+5+52+...+59 / 1+5+52+...+58
a) 11/12-(2/5+x)=2/3 b) 2x.(x-1/7)=0 c) 3/4+1/4:x=-2/5
Câu 2.Thực hiện phép tính:
a) \(\left(\dfrac{-1}{7}\right)^0-2\dfrac{4}{9}.\left(\dfrac{2}{3}\right)^2\)
b)\(\left(\dfrac{1}{3}-\dfrac{5}{6}\right)^2+\dfrac{5}{6}:2\)
Giúp mình 7 bài này với ạ
Bài 1
4 x ( 2 - | X | ) + 5 | X | = 7
Bài 2
| 3x -2 |^2004 = | 3x -2 |^2004
^ là mũ ạ
Bài 3
| 1 - 2x | + x + 2 = 0
Bài 4
| 5x -3 | = | 7 - x |
Bài 5
2^5x : 2^3x = 4
Bài 6
3^x+1=81
Bài 7
1 phần 4 - ( 2x -1 ) ^ 2 = 0