Các câu hỏi tương tự
Chứng minh :
a, S= 1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
b, P = 1/2+1/2^2+...+1/2^20< 1
1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
Chứng minh;
S=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
S=1/2+1/2^2+1/2^3+...+1/2^20<1
so sánh A=1/5 +1/13+1/14+1/15+1/61+1/62+1/63 va F = 1004/2006
a , ( 54.62-62+19.62 ) :72 = ??
b (1000 : 99 +1 ) . 62 -26 .63 -36
c , x +1 = 88 : 9 +20 :20
thực hiện phép tính
Chứng minh
a=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
Tính hợp lý
1-2-3+4+5-6-7+8+9-10-11+12+..........+61-62-63+64
Cho B=1/61+1/62+1/63+.....+1/80.Chứng minh B<1/2