计算:1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/15 04:42:31
![计算:1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20](/uploads/image/z/107327-47-7.jpg?t=%E8%AE%A1%E7%AE%97%3A1%E5%8F%881%2F2%2A5%2B3%E5%8F%881%2F5%2A8%2B5%E5%8F%881%2F8%2A11%2B7%E5%8F%881%2F11%2A14%2B9%E5%8F%881%2F14%2A17%2B11%E5%8F%881%2F17%2A20)
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计算:1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20
计算:1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20
计算:1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20
1又1/2*5+3又1/5*8+5又1/8*11+7又1/11*14+9又1/14*17+11又1/17*20
=1+3+5+7+9+11+1/2*5+1/5*8+.+1/17*20
=(1+11)*6/2+1/2*5+1/5*8+.+1/17*20
=36+(1/2-1/5+1/5-1/8+...+1/17-1/20)/3
=36+(1/2-1/20)/3
=36+3/20
=36又3/20