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987 = 9 . 102 + 8 . 10 + 7;
2564 = 2 . 103 + 5 . 102 + 6 . 10 + 4;
abcde = a . 104 + b . 103 + c . 102 + d . 10 + e
987 = 9 . 102 + 8 . 10 + 7;
2564 = 2 . 103 + 5 . 102 + 6 . 10 + 4;
abcde = a . 104 + b . 103 + c . 102 + d . 10 + e
987=9.100+8.10+7 nghĩa là :
987=9.10^2+8.10^1+7.10^0
2564=2.10^3+5.10^2+6.10^1+4.10^0
abcde=a.10^4+b.10^3+c.10^2+d.10^1+e.10^0
987 = 9 . 102 + 8 . 10 + 7;
2564 = 2 . 103 + 5 . 102 + 6 . 10 + 4;
= a . 104 + b . 103 + c . 102 + d . 10 + e
Ta có: 987 = 100.9+10.8+7
= 10\(^2\).9+10\(^1\).8+10\(^0\).7
2564= 1000.2+100.5+10.6+4
=10\(^3\).2+10\(^2\).5+10\(^1\).6+10\(^0\)+4
\(\overline{abcde}\)= 10000.a+1000.b+100.c+10.d+e
=10\(^4\).a+10\(^3\).b+10\(^2\).c+10\(^1\).d+10\(^0\).e
\(987=10^2.9+10^1.8+10^0.7\)
\(2564=10^3.2+10^2.5+10^1.6+10^0.4\)
\(\overline{abcde}=10^4.a+10^3.b+10^2.c+10^1.d+10^0.e\)
\(213=200+10+3=2\cdot100+10+3=2\cdot10^2+10^1+3\)
\(421=400+20+1=4\cdot100+2\cdot10+1=4\cdot10^2+2\cdot10^1+1\)
\(2009=2000+9=2\cdot1000+9=2\cdot10^3+9\)
\(abc=a\cdot100+b\cdot10+c=a\cdot10^2+b\cdot10^1+c\)
\(abcde=a\cdot10000+b\cdot1000+c\cdot100+d\cdot10+e=a\cdot10^4+b\cdot10^3+c\cdot10^2+d\cdot10^1+e\)
a﴿ 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.10 2 + 10 1 + 3
b﴿ 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.10 2+ 2.10 1 + 1
c﴿ 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.10 3 + 9
d﴿ abc = a.100 + b.10 + c = a.10 2 + b.10 1 + c
e﴿ abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10 4+ b.10 3+ c.10 2+ d.10 1 + e
987 = 900 + 80 + 7
= 9.100 + 8.10 + 7
= 9.10^2 + 8.10^1 + 7.10^0
2564 = 2000 + 500 + 60 + 4
= 2.1000 + 5.100 + 6.10 + 4
= 2.10^3 + 5.10^2 + 6.10^1 + 4.10^0
abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10^4 + b.10^3 + c.10^2 + d.10^1 + e.10^0
987 \(= 900 + 80 + 7\)
\(= 9 . 100 + 8 . 10 + 7\)
\(=\) \(9 . 10^2 + 8 . 10 ^1 + 7.10 \)
2564 \(= 2000 + 500 + 60 + 4\)
\(=2.1000 + 5.100 + 6.10 + 4\)
\(=\) \(2.10^3 - 5.10^2 + 6.10^1 + 4 .10\)
abcde \(= a.10000 + b.1000 + c.100 + d.10+e\)
\(= a.10^4 + b . 10^3 + c.10^2 + d.10 + e . 10\)
HỌC TỐT NHÉ~~
213 = 2.102 + 1.101 + 3.100
421 = 4.102 + 2.101 + 1.100
2009 = 2.103 + 0.102 + 0.101 + 9.100
abc = a.102 + b.101 + c.100
abcde = a.104 + b.103 + c.102 + d.101 + e.100
\(213=2×10^2+1×10^1+3×10^0\)
\(421=4×10^2+2×10^1+1×10^0\)
\(2009=2×10^3+0×10^2+0×10^1+9×10^0\)