-72×(1/4+1/6+1/2)
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-72×(1/4+1/6+1/2)-72×(1/4+1/6+1/2)-72×(1/4+1/6+1/2)-72*(11/12)=-66
-72×(1/4+1/6+1/2)
-72×(1/4+1/6+1/2)
-72×(1/4+1/6+1/2)
-72*(11/12)=-66
-72×(1/4+1/6+1/2)
计算:-72×(1/4+1/6-1/2)
1/2 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=(1+ 1/2+ 1/3+ 1/4+ 1/5)×(1/2+ 1/3+ 1/4+ 1/5+ 1/6)-(1+ 1/2+ 1/3+ 1/4+1/5+ 1/6)×(1/2+ 1/3+ 1/4+ 1/5)
(1*3*24+2*6*48+3*9*72)/(1*2*4+2*4*8+3*6*12)
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 =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/(9*10) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1
1/2+1/4+1/6+1/32+1/72=
1,2,3,4,6,8,14,16,18,24,( ),( ),72,96,144,288
(1*2*24+2*6*48+3*9*72+4*12*96)/(1*2*4+2*4*8+3*6*12+4*8*16)
1/3+1/15+1/35+1/63+1/99(1+1/2)(1+1/3)(1+1/4)……(1+1/100)1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/901/12+1/20+1/30+1/42
1/2+1/6+1/12+...+1/72简便运算
-72*(1/4-5/9+7/12)/(-2)
计算:(1)√2×√5;(2)√3×√12;(3)2√6×√1/2(4)√288×√1/72
100,102,104,108,()1,1,2,2,3,4,3,5,()1/72,1/36,1/12,1/6,()
-72×(1/4-5/9+12/7)÷(-2)
请问:速算(巧算)...请阅题:第一题:1/16+1/32+1/64+1/128=?第二题:1/2+1/6+1/12+1/20+1/30+1/42+1/56=?第三题:1+2又1/6+3又1/12+4又1/20+6又1/42+7又1/56+8又1/72+9又1/90
2×3分之1=2分之1 - 3分之1 3×4分之1=3分之1 - 4分之1 2×4分之1=2分之1×(2分之1 - 4分之1)……一.从中你发现了什么?二.利用你的发现计算下面两题(1)1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90(2)1/1×4+1
1×3×24+2×6×48+3×9×72/(1×2×4+2×4×8+3×6×12)为什么
几道分数题,/代表分之,1.计算:1998除以1998又1998/1999+1/20002.计算:(1+2/1)*(1+4/1)*(1+6/1)*.*(1+10/1)*(1-3/1)*(1-5/1)*.*(1-9/1)*(1-11/1)3.:计算:1*2*4+2*4*8+3*6*12/1*3*24+2*6*48+3*9*72(分数