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
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![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](/uploads/image/z/346063-31-3.jpg?t=39%C3%97148%2F169%2B148%C3%9786%2F149%2B48%C3%9774%2F169+41%E5%8F%881%2F3%C3%973%2F4%2B51%E5%8F%881%2F4%C3%974%2F5%2B61%E5%8F%881%2F5%C3%975%2F6)
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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