简便计算,有点难1/4*3.5*5.4 / 0.9*3*2.5*4.9 2/3+2/15=2/35+2/631/1*2+1/2*3+1/3*4+.+1/99*100
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 08:36:59
![简便计算,有点难1/4*3.5*5.4 / 0.9*3*2.5*4.9 2/3+2/15=2/35+2/631/1*2+1/2*3+1/3*4+.+1/99*100](/uploads/image/z/13265028-36-8.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C%E6%9C%89%E7%82%B9%E9%9A%BE1%2F4%2A3.5%2A5.4+%2F+0.9%2A3%2A2.5%2A4.9+2%2F3%2B2%2F15%3D2%2F35%2B2%2F631%2F1%2A2%2B1%2F2%2A3%2B1%2F3%2A4%2B.%2B1%2F99%2A100)
简便计算,有点难1/4*3.5*5.4 / 0.9*3*2.5*4.9 2/3+2/15=2/35+2/631/1*2+1/2*3+1/3*4+.+1/99*100
简便计算,有点难
1/4*3.5*5.4 / 0.9*3*2.5*4.9
2/3+2/15=2/35+2/63
1/1*2+1/2*3+1/3*4+.+1/99*100
简便计算,有点难1/4*3.5*5.4 / 0.9*3*2.5*4.9 2/3+2/15=2/35+2/631/1*2+1/2*3+1/3*4+.+1/99*100
2/3+2/15+2/35+2/63
=(2/3+2/15)+(2/35+2/63)
=4/5+28/315
=91/315
1/1*2+1/2*3+1/3*4+.+1/99*100
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
=1-1/100
=99/100