\(\frac{27}{23}\)+ \(\frac{5}{15}\)+ \(\frac{3}{7}\)-\(\frac{4}{23}\)- \(\frac{12}{9}\)= \(\frac{27}{23}\)+ \(\frac{1}{3}\)+ \(\frac{3}{7}\)-\(\frac{4}{23}\)- \(\frac{4}{3}\)
= (\(\frac{27}{23}\)- \(\frac{4}{23}\)) + (\(\frac{1}{3}\)- \(\frac{4}{3}\)) + \(\frac{3}{7}\)
= 1+ (-1) + \(\frac{3}{7}\)= \(\frac{3}{7}\)
Tính giá trị biểu thức
\(1.A=\frac{1}{5}+\frac{3}{17}-\frac{4}{3}+\left(\frac{4}{5}-\frac{3}{17}+\frac{1}{3}\right)-\frac{1}{7}+\left[\frac{-14}{30}\right]\)
\(2.B=\left(\frac{5}{8}-\frac{4}{12}+\frac{3}{2}\right)-\left(\frac{5}{8}+\frac{9}{13}\right)-\left[\frac{-3}{2}\right]+\frac{7}{-15}\)
\(3.C=\frac{5}{18}+\frac{8}{19}-\frac{7}{21}+\left(\frac{-10}{36}+\frac{11}{19}+\frac{1}{3}\right)-\frac{5}{8}\)
\(4.D=\frac{1}{9}-\left[\frac{-5}{23}\right]-\left(\frac{-5}{23}+\frac{1}{9}+\frac{25}{7}\right)+\frac{50}{14}-\frac{7}{30}\)
\(5.E=\frac{1}{13}+\left(\frac{-5}{18}-\frac{1}{13}+\frac{12}{17}\right)+\left(\frac{12}{17}+\frac{5}{18}+\frac{7}{5}\right)\)
\(6.F=\frac{15}{14}-\left(\frac{17}{23}-\frac{80}{87}+\frac{5}{4}\right)+\left(\frac{12}{17}-\frac{15}{14}+\frac{1}{4}\right)\)
\(7.G=\frac{1}{25}-\frac{4}{27}+\left(\frac{-23}{27}+\frac{-1}{25}-\frac{5}{43}\right)+\frac{5}{43}-\frac{4}{7}\)
\(8.H=\frac{4}{15}-\frac{23}{28}-\left(\frac{-23}{28}+\frac{-11}{15}-\frac{29}{27}\right)-\frac{2}{27}\)
\(9.K=\frac{1}{16}-\frac{5}{21}+\left(\frac{-1}{16}+\frac{-3}{5}-\frac{-5}{21}\right)+\frac{-2}{5}+\frac{3}{4}\)
\(10.L=\frac{7}{12}+\frac{15}{14}-\left(\frac{14}{22}+\frac{-1}{14}+\frac{5}{21}\right)-\frac{-5}{21}+\frac{3}{5}\)
mọi người ơi pls help me
1) -10/11 . 8/9 + 7/18 . 10/11 2) 12/25 . 23/7 - 12/7 . 13/25 3) 3/7 . 16/15 - 2/15 . -3/7 4) -4/13 . 5/17 + -12/13 . 4/17
Bài 1: tính
1, 1-5+7-8+4-1+5-7+8
2, 14-23+(5+14)-(5-23)+17
3, 12-44+9-3+14-19-9-12
4,22-(4-8+12)+(-8-12+4)
Bài 1.10: Rút gọn các biểu thức sau:
a) A =
4 3 9
7 7 7 4 2.8 .27 4.6 2 .6 2 .40.9 + +
b) B =
( ) 32 5
23
23 . . 1 34 25 . 5 12 −− −
1) Tính giá trị các biểu thức :
a) C = 5/18 + 8/19 - 7/21 + ( -10/36 + 11/19 + 1/3) - 5/8
b) F = 15/14 - ( 17/23 - 80/87 + 5/4 ) + ( 17/23 - 15/14 + 1/4 )
c) G = 1/25 - 4/27 + ( -23/27 + -1/25 - 5/43 ) + 5/43 - 4/7
Bài 1: Tính
a) -7/9 . 2/3/4 (2/3/4 là hỗn số : 2 là số nguyên, 3/4 là phân số)
b) 2/3 + 1/3 . (-2/5)
c) 3/4 . 15/1/3 - 3/4 . 43/1/3
d) (-49,1) . 13/27 - 58,9 . 13/27
e) 0,375 : (-4,5)
f) 3/1/7 : (-1/3/7)
g) 9/1/3 : 4/2/3 - 2
h) (7/3/4 : 0,3125 + 4,5 . 2/2/45) : (-8,5)
Bài 2: Tính giá trị biểu thức
A = (-6/11) . 7/10 . (11/-6).(-20)
B = (-1/9) . (-17/29) . 58/51
C = (-3/7) . 5/11 + (-5/14) . 5/11
D = (1/1/27 . 12/23 . 9/14) : (-3/23)
Bài 3: Tìm x
a) 3/7 . x - 2/5 . x = -17/35
b) (3/4 . x -9/16) . [1/3 + (-3/5) : x] = 0
c) (x + 3/5) . (x + 1) = 0
A=27/23+5/21-4/23+16/21+1/2
B=6.(-1/3)^3-3.(-1/3)^2.(-1/3)+1
C = 23và1/3(hỗn số):(-5/7)-13 Và 1/3:(-5/7)
D=(-0.75-1/4):(-5)+1/15-(-1/5):(-3)
-4/27 - 7/12 + -23/27 + 17/12
1. Tính
a, 5/7-4/3+-|2/7|+1/3-5/13
b. 5/8+14/5+|-3,8|+13/7-|-9/6|
c. 4/8-12/50-(-1/2)+|-19/25|-3
d, 5/15+(-23/5)-(-2/5)+(-18/5)
