1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
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1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
![1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便](/uploads/image/z/1940656-40-6.jpg?t=1%2F1x4%2B1%2F4x7%2B1%2F7x10%2B1%2F10x13%2B1%2F13X16+%E7%AE%80%E4%BE%BF)
1/1x4+1/4x7+1/7x10+1/10x13+1/13X16
=(1/3) × [ (1-1/4) + (1/4-1/7) + (1/7-1/10) + (1/10-1/13) + (1/13-1/16) ]
=(1/3) × [ 1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16 ]
=(1/3) × [ 1-1/16 ]
=(1/3) × (15/16)
=5/16
=(1/3) × [ (1-1/4) + (1/4-1/7) + (1/7-1/10) + (1/10-1/13) + (1/13-1/16) ]
=(1/3) × [ 1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16 ]
=(1/3) × [ 1-1/16 ]
=(1/3) × (15/16)
=5/16
1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
计算:1x4分之一+4x7分之一+7x10分之一+10x13分之一+13x16分之一
1/1X4+1/4X7+1/7X10+1/10X13+1/13X16(简算)
1/(1x4)+1/(4x7)+1/(7x10)+1/(10x13)简便运算 找规律 急
1X4分之1十4X7分之1十7X10分之1十10X13分之1简算
数学趣味知识园开幕H1.1X4/1+4X7/1+7X10/1+10X13/1+.+97X100/1 2.1X2X3/1+
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注:1x4、4x7、7x10等均为分母
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