\(5D=5+5^3+...+5^{201}\)
\(\Leftrightarrow4D=5+5^3+...+5^{201}-1-5^2-5^3-...-5^{200}\)
\(\Leftrightarrow4D=5^{201}-21\)
hay \(D=\dfrac{5^{201}-21}{4}\)
Bài 1.Tìm x
a,210-5x=200
b,210-5(x-10)=200
c,450:[41-(2x-5)]=3^2.5
d,350:x+10=20
e,36:(x-5)=2^2
f,[3.(70-x)+5]:2=46
a,210-5(x-11)=200
b,(2x+1):7=2^2+3^2
c,450:[41-(2x-5]=3^2.5
d,(5x-9).7+3=80
D = 4/5 + 4/5 ^ 2 - 4/5 ^ 3 + ...... + 4/5 ^ 200
mong trả lời sớm
tính gọn:
A=2+2^2+2^3+2^4+.....+2^200
B=1+3+3^2+3^2+.....+2007
C=4+4^2+4^3+4^4+...+4^100
D=5+5^2+5^3+....+5^150
Tìm x ,biết A,2.x(x+1)-135=-200 B,4.x-5.(x-1)+15=13 C,2/3.x-1/4=3/5-7/8 D,1/2.(2.x-3)+105/2=-137/2
d. 1 - 2 + 3 - 4 + 5 - 6+ ... + 199 - 200
1 a)(6x+4).5=200
b,71+(26-3x):5=75
c,4(2X-6)=16
D,5^3+2-2.5^2=5^2.3
2)CHỨNG MINH :(3+3^2+3^3+3^4+3^6)CHIA HETcho 3
Tính các tổng sau bằng cách hợp lý:
C=4+4^2+4^3+...+4^n
D=1+5^2+5^4+...+5^200
E=1+2^2+2^4+...+2^100
tính các tổng sau
1) A = 1+7+7^2+7^3+....+7^2007
2) B= 1+4 +4^2+4^3+....+4^100
3) C= 1+3^2 +3^4 +3^6+3^8+....+3^100
4) D= 7+7^3 + 7^5+7^7+7^9+....+7^99
5)E= 2+2^3+2^5+2^7+2^9+....+2^2009
6) B = 1+2^2+2^4+2^6+2^8+....+2^200
7) C= 5+5^3+5^5+5^9+....+5^101
8) D = 13+13^3+13^5+...+13^99
Bài 1.Tìm x
a,210-5x=200
b,210-5(x-10)=200
c,450:[41-(2x-5)]=3^2.5
d,350:x+10=20
e,36:(x-5)=2^2
f,[3.(70-x)+5]:2=46
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