39×148/169+148×86/149+48×74/169 41又1/3×3/4+51又1/4×4/5+61又1/5×5/6

39×148/169+148×86/149+48×74/169 41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
39×148/169+148×86/149+48×74/169 41又1/3×3/4+51又1/4×4/5+61又1/5×5/6

39×148/169+148×86/149+48×74/169 41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
39×148/169+148×86/149+48×74/169
=39×148/149＋86×148/149＋24×148/149
=（39＋86＋24）×148/149
=149×148/149
=148
41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
=124/3×3/4+205/4×4/5+306/5×5/6
=124/4+205/5+306/6
=31+41+51
=123

不能 thank

39*148/169+148*86/149+48*74/169
=39×148/149＋86×148/149＋24×148/149
=（39＋86＋24）×148/149
=149×148/149
=148
41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
=41又1/3×3/4+51又1/4×4/5+61又1/5...

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39*148/169+148*86/149+48*74/169
=39×148/149＋86×148/149＋24×148/149
=（39＋86＋24）×148/149
=149×148/149
=148
41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
=41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
=124/3×3/4+205/4×4/5+306/5×5/6
=124/4+205/5+306/6
=31+41+51
=123
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