so sanh (a+1).(a+2).(a+3)-a.(a+1).(a+2) va 3(a+1).(a+2)
b,tinh
M=1.2+2.3+3.4+...+ 2002.2003
GIUP MINH NHANH LEN NHE CAC BAN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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14 tháng 1 2018 lúc 13:34
Cho A=1.2+2.3+3.4+4.5+............+2017.2018 va B=2018 mu3/3 So sanh A va B
cho bài kham khảo nè :
A=1.2+2.3+3.4+4.5+...+2017.2018
=> 3A=1.2.3+2.3.3+3.4.3+4.5.3+...+2017.2018.3
3A=1.2.3+2.3(4-1)+3.4(5-2)+4.5(6-3)+...+2017.2018.(2019-2016)
3A=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+4.5.6-3.4.5+...+2017.2018.2019-2016.2017.2018
3A=(1.2.3+2.3.4+3.4.5+4.5.6+...+2017.2018.2019)-(1.2.3+2.3.4+3.4.5+...+2016.2017.2018)
=> 3A=2017.2018.2019 => \(A=\frac{2017.2018.2019}{3};B=\frac{2018^3}{3}=\frac{2018.2018.2018}{3}\)
Ta có: 2017.2019=2017(2018-1)=2017.2018+2017<2017.2018+2018=2018(2017+1)=2018.2018
=> 2017.2018.2019<2018.2018.2018
=> A<B
thank nha
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A=1.2+2.3+3.4+...+2017.2018
3A=1.2.3+2.3.3+3.4.3+...+2017.2018.3
3A=1.2.3+2.3.(4−1)+3.4.(5−2)+...+2017.2018.(2019−2016)
3A=1.2.3+2.3.4−1.2.3+3.4.5−2.3.4+...+2017.2018.2019−2016.2017.2018
⇒3A=2017.2018.2019
⇒A=2017.2018.20193
A=2017.2018.20193;B=201833=2018.2018.20183
A=2739315938;B=2739316611
⇒A<B
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\(A=1.2+2.3+3.4+4.5+............+2017.2018\)
\(3A = 1.2.3 + 2.3.4 +..............+ 2017.1018.3\)
\(3A = 1.2.3 + 2.3.(4-1) + .............. + 2017.2018.(2019-2016)\)
\(3A = 1.2.3 + 2.3.4 - 1.2.3 + ............. + 2017.2018.2019 - 2016.2017.2018\)
\(3A = 2017.2018.2019\)
\(A = \frac{2017.2018.2019}{3}\)
\(B =\frac {2018^3}{3}\)
đến đây ko bt lm
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Xem thêm câu trả lời
Cho A=1.2+2.3+3.4+4.5+............+2017.2018 va B=2018 mu3/3 So sanh A va B
A=1.2+2.3+3.4+4.5+...+2017.2018
=> 3A=1.2.3+2.3.3+3.4.3+4.5.3+...+2017.2018.3
3A=1.2.3+2.3(4-1)+3.4(5-2)+4.5(6-3)+...+2017.2018.(2019-2016)
3A=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+4.5.6-3.4.5+...+2017.2018.2019-2016.2017.2018
3A=(1.2.3+2.3.4+3.4.5+4.5.6+...+2017.2018.2019)-(1.2.3+2.3.4+3.4.5+...+2016.2017.2018)
=> 3A=2017.2018.2019 => \(A=\frac{2017.2018.2019}{3}\); \(B=\frac{2018^3}{3}=\frac{2018.2018.2018}{3}\)
Ta có: 2017.2019=2017(2018-1)=2017.2018+2017<2017.2018+2018=2018(2017+1)=2018.2018
=> 2017.2018.2019<2018.2018.2018
=> A<B
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Bui The Hao lam dung roi
mk cung dang can bai nay
Thanks vi da dang honganh
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so sanh a+1/a+3 va a+3/a+5;a+2/a+4 va a-1/a+5
1993/1995va997/998;3/10va17,49
cac phan chi co 1cap phan so
cac ban trinh bay ra cho minh nha
A = 3/1.2 + 3/2.3 + 3/3.4 + . . .+ 3/2017.2018 .Tim tong cua day so A
B=5/2.5 + 5/5.8 + . . .+5/299.302 .Tim tong day so B
C = 2/1.7 + 2/7.13 + . . .+2/601.607 .Tim tong day so C
D = 1/1.3 + 1/3.5 + . . .+1/(2n + 1)(2n + 3) .Tim day so D
CAC BAN GIUP MINH VOI . CAC BAN GIUP MINH MINH TICK CHO NHE
(a+a^2+a^3+a^4+...+a^29+a^30) chia het cho (a+1) (a thuoc N)
cac ban giup minh voi nhanh len nhe minh dang can gap
a, so sánh (a+1).(a+2).(a+3)-a.(a+1).(a=2) và 3. (a+1).(a+2)
b/ tính P = 1.2+2.3+3.4+...+2004.2005
cau 1: Cho A frac{100^{2014}+2}{3}-frac{100^{2015}+17}{9}.tong cac cua so cua B-9ACau 2: So sanh Afrac{1}{1.2}+frac{1}{2.3}+frac{1}{3.4}+........+frac{1}{100.101}voi 1 ta doc A....1Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet frac{b+c+d}{a}frac{c+d+a}{b}frac{d+a+b}{c}frac{a+b+c}{d}k. Vay kCau 4 : so cac so nguyen am x thoa man x^{2015}left(-2right)^{2014}Cau 5; tim x,y,z biet frac{x}{y}frac{10}{9},frac{y}{z}frac{3}{4}va x-y+z78Cau 6: tap hop cac so co ba chu so chia het cho 18 va to...
Đọc tiếp
cau 1: Cho A= \(\frac{100^{2014}+2}{3}-\frac{100^{2015}+17}{9}.\)tong cac cua so cua B=-9A
Cau 2: So sanh A=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{100.101}\)voi 1 ta doc A....1
Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet \(\frac{b+c+d}{a}=\frac{c+d+a}{b}=\frac{d+a+b}{c}=\frac{a+b+c}{d}=k\). Vay k=
Cau 4 : so cac so nguyen am x thoa man \(x^{2015}=\left(-2\right)^{2014}\)
Cau 5; tim x,y,z biet \(\frac{x}{y}=\frac{10}{9},\frac{y}{z}=\frac{3}{4}\)va x-y+z=78
Cau 6: tap hop cac so co ba chu so chia het cho 18 va tong cac chu so ti le voi 1;2;3 la
Cau 7: gia tri cua tong S=1.2+2.3+.....+49.50 la S=
cho A=1/2.3/4.5/6........99/100 va B=2/3.4/5.5/6.........100/101 so sanh A va B
1.Tính:
A=1.2+2.3+3.4+......+99.100
B=1.2.3+2.3.4+.....+98.99.100
C=1.2+2.3+5.6+.......+99.100
2.A=3+3^2+3^3+.....+3^2016
a,Chứng minh rằng A chia hết cho 52
b,Tìm cs tận cùng của A
Các bn giúp mk nha,ai nhanh,ai đúng mk k!
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