规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么· 等于多少
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规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么·等于多少规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(
规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么· 等于多少
规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么· 等于多少
规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么· 等于多少
按题设的规律,(6)=5*6*7,(7)=6*7*8,
由等式知·=(7)/(6)+1=(6*7*8)/(5*6*7)+1=13/5
1/1x2x3+1/2x3x4+1/3x4x51/2x3x4 + 1/3x4x5 + 1/4x5x6 +……+1/99x100x101是 1/(2x3x4)
规定(3)=2X3X4,(4)=3X4X5,(5)=4X5X6,.如果1/(6)+1/(7)=1/(7)X·,那么· 等于多少
1x2x3+2x3x4+3x4x5+...+7x8x9=,
1x2X3+2x3X4+3x4X5+…+7X8X9=?
解方程(“X”乘号,“x”未知数)3X3X432=4X4X x还有一个:1500:1200=(6-x):x
1又2分之1:0.4=1.35:x4x-7x1.3=9.9
阅读下列材料:1x2=3分之1(1x2x3-0x1x2),2x3=3分之1(2x3x4-1x2x3),3x4=3分之1(3x4x5-2x3x4),阅读下列材料:1x2=3分之1(1x2x3-0x1x2),2x3=3分之1(2x3x4-1x2x3),3x4=3分之1(3x4x5-2x3x4),由以上三个等式相加,
2/1x2x3+2/2x3x4+2/3x4x5+2/4x5x6+...+2/98x99x100=
1x2x3+2x3x4+3x4x5+4x5x6+...+n(n+1)(n+2)=
请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
已知2*3=2x3x4,4*2=4x5, 那么(6*3)—(7*2)=( )
如果定义(3)=2x3x4,(5)=4x5x6,(9)=8x9x10,那么(4)+(6)是多少?
已知2#3=2X3X4,4#2=4X5请计算(6#3)-(5#2)等于多少
1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x4)由此推断1x2x3+2x3x4+3x4x5.7x8x9=?
1x2=1/3x(1x2x3-0x1x2)2x3=1/3x(2x3x4-1x2x3)3x4=1/3x(3x4x5-2x3x4)求1x2x3+2x3x4+3x4x5+...+7x8x9=?
1x2+2x3+3x4+4x5+……+10x11 依据:1x2=1/3(1x2x2-0x1x2),(1/3是三分之一) 2x3=1/3(2x3x4-1x2x3)3x4=1/3(3x4x5-2x3x4)你能运用这种规律来做吗?
(1/2)X>(1/3)X4X-3≥1上面两个不等式组成一个不等式组,
1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+1/5x6x7=?这类题