1-1/2=1/2,1/2-1/3=1/6=1/2*3,1/3-1/4=1/12=1/3*4,1/4-1/5=1/20=1/4*5.再计算下列各式的值(1) 1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100(2)1/3+1/15+1/35+1/63+.1/17*19
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![1-1/2=1/2,1/2-1/3=1/6=1/2*3,1/3-1/4=1/12=1/3*4,1/4-1/5=1/20=1/4*5.再计算下列各式的值(1) 1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100(2)1/3+1/15+1/35+1/63+.1/17*19](/uploads/image/z/3742862-14-2.jpg?t=1-1%2F2%3D1%2F2%2C1%2F2-1%2F3%3D1%2F6%3D1%2F2%2A3%2C1%2F3-1%2F4%3D1%2F12%3D1%2F3%2A4%2C1%2F4-1%2F5%3D1%2F20%3D1%2F4%2A5.%E5%86%8D%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC%281%29+1%2F1%2A2%2B1%2F2%2A3%2B1%2F3%2A4%2B1%2F4%2A5%2B.1%2F99%2A100%282%291%2F3%2B1%2F15%2B1%2F35%2B1%2F63%2B.1%2F17%2A19)
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