6+8+24+56+2+7=
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\(\dfrac{5}{6}-\dfrac{5}{8}+\dfrac{7}{12}=\dfrac{10}{48}+\dfrac{7}{12}=\dfrac{38}{48}\)
Tính :
a) \(\frac{6}{7}+\frac{12}{5}:\frac{8}{7}=\frac{6}{7}+\frac{21}{10}=\frac{60}{70}+\frac{147}{70}=\frac{207}{70}\)
b) \(\frac{24}{7}\)- \(\frac{5}{8}\)x \(2\)= \(\frac{24}{7}-\frac{5}{4}=\frac{96}{28}-\frac{35}{28}=\frac{61}{28}\)
=6/7+(12.7)/(5.8)=6/7+(3.7)/(5.2)=6/7+21/10=(60+21*7)/70=207/70
1.
$(5^{1986}-5^{1985}):5^{1985}=5^{1985}(5-1):5^{1985}=5-1=4$
2.
\((7^{846}+7^{847}):7^{846}=7^{846}(1+7):7^{846}=1+7=8\)
3.
\((9^{2018}-3^{4036}):6^{2006}=[(3^2)^{2018}-3^{4036}]:6^{2006}\)
$=(3^{4036}-3^{4036}):6^{2006}=0:6^{2006}=0$
4.
$(7^{80}.8^{70}-56^{70}):56^{70}$
$=[7^{10}(7.8)^{70}-56^{70}]:56^{70}$
$=[7^{10}.56^{70}-56^{70}]:56^{70}$
$=56^{70}(7^{10}-1):56^{70}=7^{10}-1$
5.
$4^{4016}:(4^{4017}-4^{4016})=4^{4016}:[4^{4016}(4-1)]$
$=4^{4016}:4^{4016}:3=1:3=\frac{1}{3}$
6.
$(12^{206}.2^{207}-24^{206}):24^{206}$
$=(12^{206}.2^{206}.2-24^{206}):24^{206}$
$=[(12.2)^{206}.2-24^{206}]:24^{206}$
$=(24^{206}.2-24^{206}):24^{206}$
$=24^{206}(2-1):24^{206}=2-1=1$
7.
$(5^2-24)^{8946}+4^{30}:2^{60}=1^{8946}+(2^2)^{30}:2^{60}$
$=1+2^{60}:2^{60}=1+1=2$
8.
$(37.8^{1007}-7.2^{3021}):8^{1007}=[37.8^{1007}-7.(2^3)^{1007}]:8^{1007}$
$=[37.8^{1007}-7.8^{1007}]:8^{1007}$
$=8^{1007}(37-7):8^{1007}=37-7=30$
103 nha
6 + 8 + 24 + 56 + 2 + 7 = 103