a.-17-11-14-(39)
=-17-11-14-39=-81.
b.125-[3-7.(-2)]
=-125-(3+14)
=-125-17
=-142.
c.(-2)7:(-2)4+8
=(-2)3+8
=8+8
=16
d.-14.9-13.(-9)
=-9(14+13)
=-9.17
=-153.
Bài 1 Tính
A) (-1/4 + 7/33 - 5/3)-(15/12+6/11-48/49)
B) 11/125-17/18-5/7+4/9+17/14
C) 1-1/2+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1
Bài 1: Tính (hợp lý nếu có thể)
a) \(\frac{8}{40}+\frac{-4}{20}-\frac{3}{5}\)
b) \(\frac{-7}{12}+\frac{-2}{12}-\frac{-3}{36}\)
c) \((\frac{1}{6}+\frac{-4}{13})-(\frac{-17}{6}-\frac{30}{13})\)
d) \(-\frac{-5}{4}+\frac{7}{4}-\frac{-11}{7}+\frac{2}{7}\)
e) \(-\frac{1}{8}+\frac{-7}{9}+\frac{-7}{8}+\frac{6}{7}+\frac{2}{14}\)
f) \(\frac{-2}{9}-\frac{11}{-9}+\frac{5}{7}-\frac{-6}{-7}\)
Tính
a, -6/11: ( 3/5 . 4/11)
b, 7/12+5/12:6-14/30
c, ( 4/5 + 1/2 ): ( 3/13-8/13)
d, ( 2/3 -1/4 +5/11):(5/12+1-7/11)
A = ( - 36) : 2 - 8 . 32 + | - 100 | : | + 20 |
B = 3 + ( - 5) + 7 + ( - 9) + 11 + ( - 13) + 15 + ( - 17)
C = 2 - 3 + 4 - 5 + 6 - 7 + ... + 2012 - 2013
giúp em ạ
thu gọn các biểu thức sau
a)C=3^14+3^15+3^16+3^17+...+3^n
b)D=3^11+3^14+3^17+3^20+...+3^2021
c) E= -5^2-5^4-5^6-5^8-...-5^1000
d)F=-5^21-5^23-5^25-5^27-...-5^2019
e)M=7^2-7^4+7^6-7^8+...-7^1000
d)N=-12+11^2+11^3-11^4-11^5+...+11^498+11^499
1. 160:{|-17|+[3^2.5-(14+2^11:2^8]}
2. 16.(38-2)-38.(16-1)
3. |-6|+(-7)+|-4|+(-3)
4. 26.(-125)-125.(-36)
5. 5^6:5^3-5^0.5^1.5^2
6. 125.(-24)+24.225
7. 21.135+21.65-200
8. 42+(-19)+58-(-19)
9. 100:{31-[24:(18-7.2)]}
10. 2^3.5-3^2.4+4.6
Bài 46:
11, - 4|x-2| = -8
12, 5|x+2| = -10(-2)
13, 6|x-2| = 18: (- 3)
14, -7|x+4| = 21 : (-3)
15, 4|x+1| = 8(-2) - 8(-5)
16, 3|x+5| = -9
17, -8|x-3| = 24 - 16: 2
18, -3|x+6| = 6.2 -9
19, 5-|x+7| = 4
20, 12-|x+8| = 10
Giúp mk nha. Mk càn ngay đó
4) so sánh hai phân số sau
a) 7/15 và 4/9
B1 tính nhanh nếu có thể
a) (-18).5+5.10+5.(-2)
b) (-15):(-5)+7.(-3/7)
c) (-157)+(-16)+257+(-43)+(-84)
d) (+23)+(-135)-(-77)-/-65/+(-30)
e) -5/7 + (-6/11+1)
f) 1/2-2/3+4/5-5/6
g)1/3.4/5+1/3.6/5+2/3
h) -5/7.2/11+-5/7.9/11+1 5/7 không phải 15 phần 7
I)19/5.2007/2017+19/5.10/2017
K) 4/25.5/9+-4/25.10/3+7/9
m) 7/19.8/11+7/19.3/11+12/19
n)17/13.18/23-4/13.18/23-(-5)/23
P) 5/7 .5/11+5/7.2/11-5/7.14/11
q)-2/17+15/19+-15/17+13/20+4/19
X)7/-25+-18/25+4/23+5/8+19/23
S)5/7.-4/19+-15/7.5/19
