Toán Lớp 6: Tính 1/1.2+1/2.3+1/3.4+…+1/99.100
1+2+3+..+100
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Toán Lớp 6: Tính 1/1.2+1/2.3+1/3.4+…+1/99.100
1+2+3+..+100
Comments ( 2 )
=1-1/2+1/2-1/3+1/3-1/4+…+1/99-1/100
=1-1/100
=100/100-1/100
=99/100
Ta có:
Số số hạng là: (100-1):1+1=100
=>1+2+3+…+100
=[(100+1).100]/2
=[101.100]/2
=[101.50.2]/2
=101.50
=5050