Các câu hỏi tương tự
Bài 1:So sánh
A=10/22017+10/22018 và B=11/22017+92018
Bài 2
\(A = {1 \over 2}.{3\over 4}.{4\over 5}.{5\over 6}.{7\over 8}. ... .{99\over 100}\) và \(x = {2\over 3}.{4\over 5}.{6\over 7}.{8\over 9}. ... .{100\over 101}\)
a,So sánh
b,Chứng minh A<1/16
1.A {3 over 5}.{2017 over 2016} - {3 over 5}- {1 over 2016} + {2 over 5}B ({12 over 199}+ {23 over 200} - {34 over 201}).({1over 2} - {1 over 3}-{1 over 6})C 2{1 over 3}+{11 over 5}: 33-{1 over 50}.(-5)2D {4^5 . 9^4 - 10 . 6^9 over 2^10 . 3^8 + 6^8 . 28}E ( -1).(-1)2.(-1)3.(-1)4......(-1)20142.A {5over2.4} + {5over4.6} + {5over6.8} + .....+ {5over48.50}B{1over3.6} + {1over6.9} + {1over9.12} +.....+{1over30.33}
Đọc tiếp
1.
\(A = {3 \over 5}.{2017 \over 2016} - {3 \over 5}- {1 \over 2016} + {2 \over 5}\)
\(B = ({12 \over 199}+ {23 \over 200} - {34 \over 201}).({1\over 2} - {1 \over 3}-{1 \over 6})\)
\(C= 2{1 \over 3}+{11 \over 5}: 33-{1 \over 50}.\)(-5)2
\(D = {4^5 . 9^4 - 10 . 6^9 \over 2^10 . 3^8 + 6^8 . 28}\)
E =( -1).(-1)2.(-1)3.(-1)4......(-1)2014
2.
\(A= {5\over2.4} + {5\over4.6} + {5\over6.8} + .....+ {5\over48.50}\)
\(B={1\over3.6} + {1\over6.9} + {1\over9.12} +.....+{1\over30.33}\)
chứng minh rằng : \({1 \over 3^2} \)+\({1 \over 4^2}\)+ \({1 \over 5^2}\) + \({1 \over 6^2}\)...+ \({1 \over 100^2}\)< \({1 \over 2}\)
Chứng minh rằng :
Nếu \({a \over b} > 1 \) thì \({a \over b} > {a + m \over b + m}\) ( a,b,m thuộc N* )
\( {1 \over 210}+{1 \over 240}+{1 \over 272}+{1 \over 306}\)
\(A = {1\over 1.3} + {1\over 3.5} + .... + {1\over 99.101}\)
So sánh
a,A=\(x = {{7^{10}+1} \over {7^{10}-1}}\) và B= \(x = {{7^{10}-1} \over {7^{10}-3}}\)
b,A=\({9^{10}+1} \over {9^{10}-1}\) và B=\({9^{10}+1} \over {9^{10}-3}\)
chứng minh \(P= {2.4.6...98 \over 3.5.7...99}\)<\({1\over 7}\)
a. 2016 : [ 25 - (3x + 2)] 32 . 7b, 52x - 3 - 2 . 52 52 . 3c,{-3 over 4x}-{20 over 11.13}-{20 over 13.15}-{20 over 15.17}-.....-{20 over 53.55}{3 over 11}d,{x over 6}+{x over 10}+{x over 15}+{x over 21}+{x over 28}+{x over 36}+{x over 45}+{x over 55}+{x over 66}+{x over 78}{220 over 39}e, x+(x-1)+(x-2)+(x-3)+......+(x-2016) 2033136
Đọc tiếp
a. 2016 : [ 25 - (3x + 2)] = 32 . 7
b, 52x - 3 - 2 . 52 = 52 . 3
c,\({-3 \over 4x}-{20 \over 11.13}-{20 \over 13.15}-{20 \over 15.17}-.....-{20 \over 53.55}={3 \over 11}\)
d,\({x \over 6}+{x \over 10}+{x \over 15}+{x \over 21}+{x \over 28}+{x \over 36}+{x \over 45}+{x \over 55}+{x \over 66}+{x \over 78}={220 \over 39}\)
e, x+(x-1)+(x-2)+(x-3)+......+(x-2016) = 2033136