Question

59x7/58+57x5/58简便算法怎么做

Answer 1

0oShmily2o0,
59×7/58＋57×5/58
＝（58＋1）×7/58＋（58－1）×5/58
＝58×7/58＋1×7/58＋58×5/58－1×5/58
＝7＋7/58＋5－5/58
＝12＋2/58
＝12又1/29