[1+(1/3-1/4)]*72
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[1+(1/3-1/4)]*72
[1+(1/3-1/4)]*72
[1+(1/3-1/4)]*72
[1+(1/3-1/4)]*72
=72+1/3×72-1/4×72
=72+24-18
=78
[1+(1/3-1/4)]*72
=72+1/3*72-1/4*72
=72+24-18
=78
78
[1+(1/3-1/4)]*72
=72+72(1/3-1/4)
=72+24-18
=78
[1+(1/3-1/4)]*72
1/3根号72化简
100,102,104,108,()1,1,2,2,3,4,3,5,()1/72,1/36,1/12,1/6,()
找规律 (1,72)(2.36)(3,24)(4,)
3分之1根号72 * 4根号12分之5
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)
简便:72*(2分之1-3分之1+4分之1)
观察下列算式,再计算:1/2-1/3=1/6,1/3-1/4=1/12,1/4-1/5=1/201/6+1/12+1/20+1/42+1/56+1/72+1/90
3/4+1/20+1/30+1/42+1/56+1/72 求如何简便点的计算
3/4+1/20+1/30+1/42+1/56+1/72 求如何简便计算快啊!!!!!!!!!!!!
-72×(1/4+1/6+1/2)
计算:-72×(1/4+1/6-1/2)
计算:1 6/1+2 12/1+3 20/1+4 30/1+5 42/1+6 56/1+7 72/1
求简算!27×1/4+72÷25%
(4/72+5/80)*x=1
2/1=1-2/1,6/1=2/1-3/1,12/1=3/1-4/1.根据以上规律计算下面题目 6/1+12/1+20/1+30/1+42/1+56/1+72/
42分之1+2又56分之1+3又72分之1+4又90分之1
(15分之72分之1)-(15分之3+4分之1)简算