139x137/138—137x1/138

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139x137/138—137x1/138
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139x137/138—137x1/138
139x137/138—137x1/138

139x137/138—137x1/138
139x137/138—137x1/138
=(139×137-137×1)/138
=(139-1)137/138
=138×137/138
=137

139x137/138+137x1/138
=(138+1)x(138-1)/138+137x1/138
=(138^2-1)/138+137x1/138
=138^2/138+(137-1)/138
=138+136/138
=138+68/69
=138又69分之68