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a)
\(5dm=\dfrac{5}{10}m=0.5m\)
\(15cm=\dfrac{15}{100}m=0.15m\)
b)
\(1h12'=1\dfrac{1}{5}h=\dfrac{6}{5}h\)
\(2h15'=2\dfrac{1}{4}h=\dfrac{9}{4}h\)
a,5 dm=\(\dfrac{5}{10}m=0,5m\);\(15cm=\dfrac{15}{100}m=0,15m\).
b,\(1h12p=1\dfrac{1}{5}h=\dfrac{6}{5}h\);\(2h15p=2\dfrac{1}{4}h=\dfrac{9}{4}h\).
a) 5hm = 5 100 km = 0,5km
b) 12dam = 12 100 km = 0,12km
c) 64m = 64 1000 km= 0,064km
d) 7dm = 7 10000 km = 0,007km
a) 5hm = 5 100 km = 0,5km
b) 12dam = 12 100 km = 0,12km
c) 64m = 64 100 km= 0,064km
d) 7dm = 7 10000 km = 0,007km
1.
a) \(3^4\times3^5\times3^6=3^{4+5+6}=3^{15}\)
b) \(5^2\times5^4\times5^5\times25=5^2\times5^4\times5^5\times5^2=5^{2+4+5+2}=5^{13}\)
c) \(10^8\div10^3=10^{8-3}=10^5\)
d) \(a^7\div a^2=a^{7-2}=a^5\)
2.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
a/ (26.16) :42
=(26.22) :(22)2
=28 : 24=24=16
b/ (510:625) : 25
= (510:54) :52
=56 : 52=53=625
c/ (81.243):3
= (34.35) :3
= 39 :3=38 =6561