计算: 1/2×4+1/4×6+1/6×8+1/8×10+1/10×12要过程和答案(详细)好的话多给分!

问题描述:

计算: 1/2×4+1/4×6+1/6×8+1/8×10+1/10×12
要过程和答案(详细)好的话多给分!

1/2×4=1/2(1/2-1/4)
其他同理
1/2×4+1/4×6+1/6×8+1/8×10+1/10×12
=1/2(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)
=1/2(1/2-1/12)
=5/24