Question

Tính tổng

A=1.3+2.4+3.5+...+99.101

Answer 1

A=1.3+2.4+3.5+....+99.101

A=1.(2+1)+2.(3+1)+.....+99.(100+1)

A=1.2+1+2.3+2+3.4+3+....+99.100+99

A=1.2+2.3+3.4+...+99.100+(1+2+3+4+....+99)

Đặt B=1.2+2.3+.....+99.100

=>3B=1.2.3+2.3.(4-1)+.....+99.100.(101-98)

=>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=33.100.101=333300

Đặt C=1+2+3+4..+99

=>C=(1+99).99:2=4950

=>A=333300+4950=338250

Answer 2

A =  1.3 + 2.4 + 3.5 + ... + 99.101

A = 1.(2+1) + 2.(3+1) + 3.(4+1) + ... + 99.(100+1)

A = 1.2 + 1 + 2.3 + 2 + 3.4 + 3 + ... + 99.100 + 99

A = ( 1.2 + 2.3 + 3.4 + ... + 99.100 ) + ( 1 + 2 + 3 + ... + 99 )

đặt B = 1.2 + 2.3 + 3.4 + ... + 99.100

3B = 1.2.3 + 2.3.3 + 3.4.3 + ... + 99.100.3

3B