求数字推理题答案 1.3/7 1/2 7/13 9/16 ( )2.一分母扩大3倍,分子不变,则分数( )A.缩小3倍 B.缩小30倍3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )

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求数字推理题答案 1.3/7 1/2 7/13 9/16 ( )2.一分母扩大3倍,分子不变,则分数( )A.缩小3倍 B.缩小30倍3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )
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求数字推理题答案 1.3/7 1/2 7/13 9/16 ( )2.一分母扩大3倍,分子不变,则分数( )A.缩小3倍 B.缩小30倍3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )
求数字推理题答案
1.3/7 1/2 7/13 9/16 ( )
2.一分母扩大3倍,分子不变,则分数( )
A.缩小3倍 B.缩小30倍
3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )

求数字推理题答案 1.3/7 1/2 7/13 9/16 ( )2.一分母扩大3倍,分子不变,则分数( )A.缩小3倍 B.缩小30倍3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )
1. 3/7 1/2 7/13 9/16 (11/19 )
3/7 5/10 7/13 9/16
3 5 7 9
7 10 13 16

2. 一分母扩大3倍,分子不变,则分数( A )
A.缩小3倍 B.缩小30倍
3.1/(12X13)+1/(13X14)+.+1/(19X20)的值是( )
1/(12X13)+1/(13X14)+.+1/(19X20)
=1/12-1/13+1/13-1/14+...+1/19-1/20
=1/12-1/20
=1/30