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
139x137/138—137x1/138
139X137/138-137X1 1/138
简算;139X137/138-137X1/138急
139x137/138+137x1/138的简便运算 答案上是275又68/69
139x137/138+137x1/138奥数减算:1993x1994-1/1993+1992x1994
计算:139x137/138+137x139/138
139x137/138+137x1又1/138的简便运算 答案上是275又68/69
1.10/7x(200/13-20/11)x0.7x143/5 2.(204+584x1991/1992x584-380)-5/89 3.139x137/138+137x1/1384.已知S=(1/3+1/5+1/7+1/11+1/13)X50055.199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8
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