Tính tính 5/6 + 3/10 + 11/30
K
Khách
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KT
3
N
24 tháng 6 2019
\(a)-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=-\frac{3}{10}+\frac{6}{11}-\frac{21}{30}+\frac{5}{11}\)
\(=\left(-\frac{3}{10}-\frac{21}{30}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=-1+1\)
\(=0\)
\(b)\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{12}{10}\)
\(=\left(\frac{13}{5}+\frac{12}{10}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\frac{19}{5}+\left(-\frac{1}{4}\right)\)
\(=\frac{71}{20}\)
24 tháng 6 2019
a) \(-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=\frac{-3}{10}+\frac{6}{11}-\frac{21}{30}+\frac{5}{11}\)
\(=\left(\frac{-3}{10}-\frac{21}{30}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=\left(\frac{-9}{30}-\frac{21}{30}\right)+1\)
\(=-1+1\)
= 0
b) \(\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{12}{10}\)
\(=\left(\frac{13}{5}+\frac{12}{10}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\left(\frac{26}{10}+\frac{12}{10}\right)-4\)
= \(\frac{19}{5}-4\)
= \(\frac{-1}{5}\)
PT
1
5 tháng 5 2019
(3/10 - 6/11) - (21/30 - 5/11) - (-1/2 +20%)
=3/10 - 6/11-21/30+5/11+1/2-1/5
=3/10 -6/11 - 7/10 +5/11 +5/10 -2/10
=(3/10-7/10+5/10-2/10)-(6/11+5/11)
=-1/10 - 1
=-11/10
=
PM
3
KN
2
2 tháng 4 2016
=(3/2-9/10)+(5/6-17/42)+(7/12-13/4)+11/30-15/56
=3/5+37+(-29/12)+11/30-15/56
=29/30+39/56+29/12
=227/840
NHỚ K MÌNH NHA
ZS
0
KT
15 tháng 10 2018
\(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+...+\frac{89}{90}\)
\(=1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+...+1-\frac{1}{90}\)
\(=8-\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\right)\)
\(=8-\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{9}-\frac{1}{10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{10}\right)\)
\(=\frac{38}{5}\)
O
9 tháng 5 2022
a) \(\dfrac{7}{30}+\dfrac{\left(-12\right)}{37}+\dfrac{23}{30}+\dfrac{\left(-25\right)}{37}=\left(\dfrac{7}{30}+\dfrac{23}{30}\right)+\left(\dfrac{-12}{37}+\dfrac{-25}{37}\right)=1+\left(-1\right)=0\)
b) \(\dfrac{5}{7}\cdot\dfrac{5}{11}+\dfrac{5}{7}\cdot\dfrac{2}{11}-\dfrac{5}{7}\cdot\dfrac{14}{11}=\dfrac{5}{7}\cdot\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)=\dfrac{5}{7}\cdot\left(-\dfrac{7}{11}\right)=-\dfrac{5}{11}\)
c) \(\dfrac{\left(-5\right)}{7}\cdot\dfrac{3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+1\dfrac{5}{7}=\dfrac{5}{7}\cdot\dfrac{-3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+\dfrac{12}{7}=\dfrac{5}{7}\cdot\left(\dfrac{-3}{13}-\dfrac{10}{13}\right)+\dfrac{12}{7}=\dfrac{5}{7}\cdot\left(-1\right)+\dfrac{12}{7}=\left(-\dfrac{5}{7}\right)+\dfrac{12}{7}=\dfrac{7}{7}=1\)
HK
15 tháng 3 2020
Tính nhanh:
912 + [88 + (-453) + (-547)]
= 912 + 88 - 453 - 547
= (912 + 88) - (453 + 547)
= 1000 - 1000
= 0
Thực hiện các phép tính sau:
6-8 = 6 + (-8) = -2
3-(-9) = 3 + 9 = 12
(-5)-10 = (-5) + (-10) = -15
0-7 = -7
4-0 = 4
(-2)-(-10) = (-2) + 10 = 8
Tính:
-2+(-6)+7- 3 = -4
-5-7-3+7 = -8
(-6)-4+5-7+12 = 0
2-(-8)+10-30 = -10
Bỏ dấu ngoặc rồi tính:
a) (4+32+6)+(10-36-6)
= 4 + 32 + 6 + 10 - 36 - 6
= (4 + 32 - 36) + (6 - 6) + 10
= 0 + 0 + 10
= 10
b) (77+22+-65)-(67+12-75)
= 77 + 22 - 65 - 67 - 12 + 75
= (77 - 67) + (22 - 12) - (65 - 75)
= 10 + 10 - (-10)
= 30
c)-(-21+43+7)-(11-53-17).
= 21 - 43 - 7 - 11 + 53 + 17
= (21 - 11) - (43 - 53) - (7 - 17)
= 10 - (-10) - (-10)
= 30
Tham khảo nha!!!
\(\dfrac{5}{6}+\dfrac{3}{10}+\dfrac{11}{30}\)
\(=\dfrac{25}{30}+\dfrac{9}{30}+\dfrac{11}{30}\)
\(=\dfrac{25+9+11}{30}=\dfrac{44}{30}=\dfrac{22}{15}\)