S1=1+2+3+...+999
S2=10+12+14+...+2018
S3=1+2+22+23+...+210
S4=1+3+32+33+34+...+3100
S5=(-1)+5+(-9)+13+...+(-41)+45
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)
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
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) \(\frac{-2}{9}-\frac{11}{-9}+\frac{5}{7}-\frac{-6}{-7}\)
RÚT GỌN
\(a,\dfrac{121.75.130.169}{39.60.11.198}\)
\(b,\dfrac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}.16^9}\)
\(c,\dfrac{5.\left(2^2.3^2\right)^9.\left(2^2\right)^6-2.\left(2^2.3\right)^{14}.3^6}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}\)
TÍNH HỢP LÍ
\(a,\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
TÍNH NHANH
\(a,13-12+11+10-9+8-7-6+-4+3+2-1\)
bài1
1) (-4/15)(-25/8)
2) 5/-14(-7/10)
3) -15/4(-16/25
4) 15(13/10
5) -21/9*-6/14
1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 +........- 299 -300 + 301 +302
Sắp xếp theo thứ tự:
* tăng dần
1/ 7; -12 ; +4 ; 0 ; │-8│; -10; -1
2/ -12; │+4│; -5 ; -3 ; +3 ; 0 ; │-5│
5 / 11
* giảm dần
3/ +9 ; -4 ; │-6│; 0 ; -│-5│; -(-12)
4/ -(-3) ; -(+2) ; │-1│; 0 ; +(-5) ; 4 ; │+7│; -8
Bài 1: Sắp xếp theo thứ tự
* tăng dần
1/ 7; -12 ; +4 ; 0 ; │-8│; -10; -1
2/ -12; │+4│; -5 ; -3 ; +3 ; 0 ; │-5│
5 / 11
* giảm dần
3/ +9 ; -4 ; │-6│; 0 ; -│-5│; -(-12)
4/ -(-3) ; -(+2) ; │-1│; 0 ; +(-5) ; 4 ; │+7│; -8
