简便计算 139×137/138-136×1又1/138
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![简便计算 139×137/138-136×1又1/138](/uploads/image/z/385650-18-0.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97+139%C3%97137%2F138-136%C3%971%E5%8F%881%2F138)
简便计算 139×137/138-136×1又1/138
简便计算 139×137/138-136×1又1/138
简便计算 139×137/138-136×1又1/138
=
137×139/138-136×139/138
=139/138
139×137/138-136×1又1/138=(138+1)x137/138-136x(138+1)/138
=(138+1)/138
=1+1/138