\(B=1.2+2.3+3.4+4.5+....+99.100\)
\(3B=1.2.3+2.3.\left(4-1\right)+3.4.\left(5-2\right)+...+99.100.\left(101-98\right)\)
\(3B=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+....+99.100.101-98.99.100\)
\(3B=99.100.101\)
\(B=\frac{99.100.101}{3}=\frac{999900}{3}=333300\)
chung to rang
1/1.2 cong 1/2.3 cong 1/3.4 cong ... cong 1/99.100 be hon 1
Tinh tong S=1.2+2.3+3.4+4.5+...+99.100
C=2CONG 4 CONG 6 CONG .......... CONG 100 TINH TONG
mk dg rat voi
jup mk vs mn oi
ko can tinh ket qua cu the hay so sanh tong A va B
a A=ABC cong DE cong 1992
B= 19BC CONG D1 CONG A9E
b A= 198 cong26 cong 574 cong 32 cong 10
B= 530 cong 124 cong 92 cong 76 cong 18
tinh tong S=1.2+2.3+3.4+...............+99.100
tinh tong
1.2+2.3+3.4+.......+99.100
tinh tong A=1.2+2.3+3.4+4.5+...+2014.2015
chung to rang tong sau co gia tri la 1 so chinh phuong
1mu3 cong 2 mua3 cong .....cong 10 mu3