Toán Lớp 6: Tính:
1/1.2+1/2.3+1/3.4+1/4.5
2/1.2+2/2.3+2/3.4+2/4.5
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Toán Lớp 6: Tính:
1/1.2+1/2.3+1/3.4+1/4.5
2/1.2+2/2.3+2/3.4+2/4.5
Comments ( 2 )
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=5/5-1/5
=4/5
=2(1/1.2+1/2.3+1/3.4+1/4.5)
=2(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5)
=2(1-1/5)
=2(5/5-1/5)
=2. 4/5
=8/5