简算:20-(2/15+1/21)×105第二题17/19×(6/17×2-5/49)第三题0.125×24×7列算式
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![简算:20-(2/15+1/21)×105第二题17/19×(6/17×2-5/49)第三题0.125×24×7列算式](/uploads/image/z/16719-15-9.jpg?t=%E7%AE%80%E7%AE%97%EF%BC%9A20%EF%BC%8D%282%2F15%2B1%2F21%29%C3%97105%E7%AC%AC%E4%BA%8C%E9%A2%9817%2F19%C3%97%286%2F17%C3%972%EF%BC%8D5%2F49%29%E7%AC%AC%E4%B8%89%E9%A2%980.125%C3%9724%C3%977%E5%88%97%E7%AE%97%E5%BC%8F)
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简算:20-(2/15+1/21)×105第二题17/19×(6/17×2-5/49)第三题0.125×24×7列算式
简算:20-(2/15+1/21)×105第二题17/19×(6/17×2-5/49)第三题0.12
5×24×7列算式
简算:20-(2/15+1/21)×105第二题17/19×(6/17×2-5/49)第三题0.125×24×7列算式
20-(2/15+1/21)×105
=20-(14+5)
=20-19
=1
17/19×(6/17×2-5/49)
=1/19×(12-17*5/49)
=1/19×(12-85/49)
=(588-85)/17*49
=503/17*49
=503/833
0.125×24×7
=0.125×8×3×7
=1×21
=21