TINH NHANH
CHO M= 22+22+23+24+...+21975
HAY SO SANH M VOI 21975
CHO B =1+2+22+23+...+22005
A =22006-1
HAY SO SANH A VOI B
so sanh 33^22 voi 22^33
33^22 = 33^2.11 = 1089^11
22^33 = 22^3.11 = 10648^11
33^22 < 22^33
so sanh A=20/39+22/27+18/43 va B=14/39+22/29+18/41
giai mau giup minh voi
xét A và B,ta thấy:
20/39>14/39
22/27>22/29
18/43<18/41
Ta có: 20/39+22/27>14/39+22/29
2012^2013+2013^2013<2013^2013+2013^2014
xet A va B ta thay:
20/39>14/39
22/27>22/29
18/43<18/41
vay A>B
khi cong 5 chu so cua 1 so tu nhien voi 22 do so xuat cua 1 ban hoc sinh da dat phep thinh nhu sau abcde + 22 = em hay so sanh tong dung va tong sai cua phep tinh do
S= 1/21+1/22+1/23+1/24+.........+1/150. So sanh S với 5/4
GIÚP MIK VỚI
\(S=\frac{1}{21}+\frac{1}{22}+...+\frac{1}{150}\)
\(=\left(\frac{1}{21}+...+\frac{1}{40}\right)+\left(\frac{1}{41}+...+\frac{1}{80}\right)+\left(\frac{1}{81}+...+\frac{1}{150}\right)\)
\(>\left(\frac{1}{40}+...+\frac{1}{40}\right)+\left(\frac{1}{80}+...+\frac{1}{80}\right)+\left(\frac{1}{150}+...+\frac{1}{150}\right)\)
\(=\frac{20}{40}+\frac{40}{80}+\frac{70}{150}\)
\(=\frac{1}{2}+\frac{1}{2}+\frac{7}{15}>\frac{5}{4}\)
so sanh
a)536và 1124
b)523 và 6*522
so sanh 20^21+3/20^22+4 va 20^22+8/20^23+28
so sanh 23/27 va 22/29
so sanh a voi b biet;
a=75/100+78/21+19/32+22/21+13/32
b=(27,5x0,1+2,5x0,1)x2
ta có: \(A=\frac{75}{100}+\frac{78}{21}+\frac{19}{32}+\frac{22}{21}+\frac{13}{32}\)
\(A=\frac{3}{4}+\left(\frac{78}{21}+\frac{22}{21}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)\)
\(A=\frac{3}{4}+4+\frac{16}{21}+1\)
\(A=5+\frac{3}{4}+\frac{16}{21}\)
\(B=\left(27,5\times0,1+2,5\times0,1\right)\times2\)
\(B=\left[\left(27,5+2,5\right)\times0,1\right]\times2\)
\(B=\left(30\times0,1\right)\times2\)
\(B=5\)
\(\Rightarrow5+\frac{3}{4}+\frac{16}{21}>5\)
\(\Rightarrow A>B\)
so sanh 23/23 va 22/29
ghi cach giai ra nhe
Ta thấy :
23/23=1 và 1> 22/29
=>23/23 > 22/29
Ta có :
\(\frac{23}{23}=1\)
\(\frac{22}{29}< 1\)
Nên :
\(\frac{23}{23}>\frac{22}{29}\)
Giup minh giai bai toan nay voi
Khong thuc hien phep tinh xet xem tich sau co tan cung bang chu so nao
a.2*12*22*32*...*2012
b.3*13*23*...*2013
c.4*14*24*...*2004
d.2*12*22*...*2020
Cac ban giai ro giup minh nha.Minh cam on