1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
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:2024/11/12 15:02:28
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
原式=1-1/2+1/2-1/3+1/3-1/4-1/4-1/5+1/5-1/6+.+1/11-1/12
=1-1/12
=11/12
再问: 麻烦,给详解一下
再答: 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132 =1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+...... +1/12*11 =1-1/2+1/2-1/3+1/3-1/4-1/4-1/5+1/5-1/6+......+1/11-1/12 =1-1/12 =11/12
=1-1/12
=11/12
再问: 麻烦,给详解一下
再答: 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132 =1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+...... +1/12*11 =1-1/2+1/2-1/3+1/3-1/4-1/4-1/5+1/5-1/6+......+1/11-1/12 =1-1/12 =11/12
若a=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132+1/
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1=?
2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1+156\1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=?
简算(要有过程)(1)1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132(2)
计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?用简便运算!
求解小学数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?