1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90等于多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 15:37:36
![1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90等于多少?](/uploads/image/z/4896-0-6.jpg?t=1+%E5%8F%881%2F2-2%E5%8F%885%2F6%2B3%E5%8F%881%2F12-4%E5%8F%8819%2F20-5%E5%8F%881%2F30%2B6%E5%8F%8841%2F42-7%E5%8F%881%2F56%2B8%E5%8F%8871%2F72-9+%E5%8F%881%2F90%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F)
1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90等于多少?
1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90等于多少?
1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90等于多少?
1 又1/2-2又5/6+3又1/12-4又19/20-5又1/30+6又41/42-7又1/56+8又71/72-9 又1/90
=(1-2+3-4-5+6-7+8-9)+(1/2-5/6+1/12-19/20-1/30+41/42-1/56+71/72-1/90)
=-9+(1/2-1+1/6+1/12-1+1/20-1/30+1-1/42-1/56+1-1/72-1/90)
=-9+(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5-1/5+1/6-1/6+1/7-1/7+1/8-1/8+1/9-1/9+1/10)
=-9+1-2/5+1/10
=-8又3/10