Tính 2/7+-3/8+11/7+1/3+1/7+5/-8+(-5,3)
K
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11 tháng 10 2020
\(\frac{2}{7}+\frac{-3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}+\frac{5}{-8}+\left(-5,3\right)\)
\(=\)\(\left(\frac{2}{7}+\frac{11}{7}+\frac{1}{7}\right)+\left(\frac{-3}{8}+\frac{-5}{8}\right)+\left(\frac{1}{3}+\frac{-53}{10}\right)\)
\(=\)\(2+\left(-1\right)+\left(\frac{10}{30}+\frac{-159}{30}\right)\)
\(=\)\(1+\frac{-149}{30}\)\(=\)\(\frac{30}{30}+\frac{-149}{30}\)\(=\)\(\frac{-119}{30}\)
31 tháng 3 2023
1: =72/90+65/90=137/90
2: =24/56-77/56=-53/56
3: =-7/10+4/5=1/10
4: =15/100-4/100=11/100
5: =4/6-5/6=-1/6
6: =10/40-15/40-76/40=-81/40
31 tháng 3 2023
7: =-9/10+7/18
=-81/90+35/90=-46/90=-23/45
8: =27/90-55/90=-28/90=-14/45
9: =36/60-50/60-35/60=-49/60
10: =-4/9+5/6-3/8
=-32/72+60/72-27/72
=1/72
VK
2
31 tháng 1 2023
\(#N\)
\(-\dfrac{11}{7}+\dfrac{13}{-2}+-\dfrac{6}{17}=-\dfrac{113}{14}+-\dfrac{6}{17}=-\dfrac{2005}{238}\)
\(\dfrac{13}{-8}+-\dfrac{7}{20}+\dfrac{3}{-8}=\left(-\dfrac{13}{8}+-\dfrac{3}{8}\right)+-\dfrac{7}{20}=-2+-\dfrac{7}{20}=-\dfrac{47}{20}\)
\(-\dfrac{4}{7}+\dfrac{11}{5}+\dfrac{1}{5}+-\dfrac{7}{3}=-\dfrac{4}{7}+\left(\dfrac{11}{5}+\dfrac{1}{5}\right)+-\dfrac{7}{3}=-\dfrac{4}{7}+\dfrac{12}{5}+-\dfrac{7}{3}=-\dfrac{53}{105}\)
19 tháng 3 2017
B=4*13/9*3-4/3*40/9
B=4/3*13/9-4/3*40/9
B=4/3*(13/9-40/9)
B=4/3*(-27)/9
B=4*(-3)/9
B=-4
DL
19 tháng 3 2017
A=6/7 + 1/7.(2/7+5/7)
A=6/7 + 1/7.7/7=6/7+1/7.1
A=6/7+1/7=7/7=1
C
10 tháng 12 2023
1) 5 + (-4) = 1
2) (-8) + 2 = -6
3) 8 + (-2) = 6
4) 11 + (-3) = 8
5) (-11) + 2 = -9
6) (-7) + 3 = -4
7) (-5) + 5 = 0
8) 11 + (-12) = -1
9) (-18) + 20 = 2
10) (15) + (-12) = 3
11) (-17) + 17 = 0
12) 16 + (-2) = 14
13) (30) + (-14) = 16
14) (-19) + 20 = 1
15) (-18) + 15 = -3
16) (10) + (-6) = 4
17) (-28) + 14 = -14
18) 15 + (-30) = -15
19) (15) + (-4) = 11
20) (-21) + 11 = -10
21) 8 + (-22) = -14
22) (-15) + 4 = -11
23) (-3) + 2 = -1
24) 17 + (-14) = 3
25) 17 + (-14) = 3
10 tháng 5 2023
2: \(=\dfrac{-2}{75}+\dfrac{5}{39}=\dfrac{33}{325}\)
3: \(=\dfrac{6}{11}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{6}{11}\)
4: \(=\dfrac{7}{19}\left(\dfrac{5}{13}+\dfrac{8}{13}-1\right)=-2\cdot\dfrac{7}{19}=-\dfrac{14}{19}\)
5: \(=\dfrac{2}{7}\left(\dfrac{4}{23}-\dfrac{27}{23}+1\right)=0\)
6: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)
HN
11 tháng 3 2018
\(\frac{2}{7}+\frac{-3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}+\frac{5}{-8}\)
= \(\frac{2}{7}+\frac{-3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}+\frac{-5}{8}\)
= \(\left(\frac{2}{7}+\frac{11}{7}\right)+\left(\frac{-3}{8}+\frac{-5}{8}\right)+\left(\frac{1}{7}+\frac{1}{3}\right)\)
= \(\frac{13}{7}+-1+\frac{10}{21}\)
= \(\frac{39}{21}+\frac{-21}{21}+\frac{10}{21}\)
= \(\frac{28}{21}\)
= \(\frac{4}{3}\)
11 tháng 3 2018
\(\frac{2}{7}+\frac{-3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}+\frac{-5}{8}\)
\(\Rightarrow\left(\frac{2}{7}+\frac{11}{7}+\frac{1}{7}\right)+\left(\frac{-3}{8}+\frac{-5}{8}\right)+\frac{1}{3}\)
\(\Rightarrow\frac{14}{7}+\frac{-8}{8}+\frac{1}{3}\)
\(\Rightarrow2+\left(-1\right)+\frac{1}{3}\)
\(\Rightarrow1+\frac{1}{3}\)
\(\Rightarrow\frac{4}{3}\)
chúc bạn học giỏi ! ^_^
\(\frac{2}{7}+-\frac{3}{8}+\frac{11}{7}+\frac{1}{7}+\frac{5}{-8}+-5,3\)
\(=\frac{2}{7}+\frac{11}{7}+\frac{1}{7}+\frac{5}{-8}-\frac{3}{8}-5,3\)
\(=2+\frac{5}{-8}-\frac{3}{8}-5,3\)
\(=-3,3-0,625-0,375\)
\(=3,3-1\)
\(=-4,3\)
Nhầm,là -3,3 ,không phải 3,3