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Xin lôi bạn, bài 1 mình không hiểu, mình sẽ giúp bạn bài 2 nha.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(213=\)\(2.10^2\) \(+1.10+3.10^0\)
\(421=4.10^2+2.10+1.10^0\)
\(1256=1.10^3+2.10^2+1.10^0\)
\(2006=2.10^3+0.10^2+0.10+6.10^0\)
abc = a . 10 ^2 + b .10 + c .10 ^ 0
abcde = a.10 ^ 4 + b.10^3 + c.10^ 2+ d .10 + e . 10 ^ 0
k cho mk nha
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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.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(3\cdot3\cdot3\cdot3\cdot3=3^5\)
b: \(y\cdot y\cdot y\cdot y=y^4\)
c: \(5\cdot p\cdot5\cdot p\cdot2\cdot q\cdot4\cdot q=25\cdot2\cdot4\cdot p^2q^2=2\cdot\left(10qp\right)^2\)
d: \(a\cdot a+b\cdot b+c\cdot c+d\cdot d\cdot d\cdot d=a^2+b^2+c^2+d^4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 213 = 2.10^2 + 1.10 + 3.10^0
b) 421 = 4.10^2 + 2.10 + 1.10^0
c) 1256 = 1.10^3 + 2.10^2 + 5.10 + 6.10^0
d) 2006 = 2.10^3 + 0.10^2 + 0.10 + 6.10^0
e) abc = a.10^2 + b.10 + c. 10^0
g) abcde = a.10^4 + b.10^3 + c.10^2 + d.10 + e.10^0
a) 213= 2.100+1.10+3=2.102+1.10+3.100 b) 421=4.100+2.10+1=4.102+2.10+1.100
c)1256=1.1000+2.100+5.10+6=1.103+2.102+5.10+6.100 d) 2006=2.1000+0.100+0.10+6=2.103+0.102+0.10+6.100
câu e bạn làm giống câu a còn câu g bạn làm giống câu c là được
nhớ k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.102 + 101 + 3
b) 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.102 + 2.101 + 1
c) 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.103 + 9
d) abc = a.100 + b.10 + c = a.102 + b.101 + c
e) abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.104 + b.103 + c.102 + d.101 + e
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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
B2 :
213 = 2 x 102 + 1 x 10 + 3 x 100
421 = 4 x 102 + 2 x 10 + 1 x 100
1256 = 1 x 103 + 2 x 102 + 5 x 10 + 6 x 100
2006 = 2 x 103 + 0 x 102 + 0 x 10 + 6 x 100
abc = a x 102 + b x 10 + c x 100
abcde = a x 104 + b x 103 + c x 102 + d x 10 + e x 100