2 1/6+4 1/12+6 1/20+8 1/30+10 1/42+12 1/56+14 1/72+16 1/90
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/12 01:24:22
2 1/6+4 1/12+6 1/20+8 1/30+10 1/42+12 1/56+14 1/72+16 1/90
2 又1/6+4又 1/12+6 又1/20+8又 1/30+10又 1/42+12又 1/56+14 又1/72+16又 1/90
=(2+4+6+8+10+12+14+16)+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=(2+16)×8÷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)
=72+(1/2-1/10)
=72+0.4
=72.4
=(2+4+6+8+10+12+14+16)+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=(2+16)×8÷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)
=72+(1/2-1/10)
=72+0.4
=72.4
2 1/6+4 1/12+6 1/20+8 1/30+10 1/42+12 1/56+14 1/72+16 1/90
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/10
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
谁能巧算1-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1等于多少
2\1-6\1-12\1-20\1-30\1-42\1-56\1-72\1-90\1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90