( 1 + 1 + 1 ) = 6
2 + 2 + 2 = 6
3 x 3 - 3 = 9
^ 4 + ^4+ ^4 = 6
5 + 5 / 5 = 6
\(\left(1+1+1\right)!=6\)
\(2+2+2=6\)
\(3\cdot3-3=6\)
\(\sqrt{4}+\sqrt{4}+\sqrt{4}=6\)
\(5+5:5=6\)
( 1 + 1 + 1 ) = 6
2 + 2 + 2 = 6
3 x 3 - 3 = 9
^ 4 + ^4+ ^4 = 6
5 + 5 / 5 = 6
\(\left(1+1+1\right)!=6\)
\(2+2+2=6\)
\(3\cdot3-3=6\)
\(\sqrt{4}+\sqrt{4}+\sqrt{4}=6\)
\(5+5:5=6\)
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
CM : 1+ 1/2+1/3+1/4+1/5+.....+1/62+1/63+1/64 > 4
Tính hợp lý
1-2-3+4+5-6-7+8+9-10-11+12+..........+61-62-63+64
Tìm x, biết:
\(a)\frac{x+1}{65}+\frac{x+2}{64}=\frac{x+3}{63}+\frac{x+4}{62}\)
\(b)\frac{x-5}{100}+\frac{x-4}{101}+\frac{x-3}{102}=\frac{x-100}{5}+\frac{x-101}{4}+\frac{x-102}{3}\)
Chứng minh:S=1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
1+2-3-4-5+6+7+8-9-19-11....-63-64-65+66+67+68
Giải chi tiết và đày đủ nha
Chứng minh: A= 1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
Tính tổng
1+2-3-4-5+6+7+8-9-10-11....-63-64-65+66+67+68
Giải chi tiết đầy đủ nha
Chứng minh rằng 3 < 1+1/2+1/3+1/4+1/5+...+1/62+1/63<6