计算：3/7*5/13-（9/14-3/14）*（-11/13）-3/7*3/13
人气：253 ℃ 时间：2019-12-01 14:38:21
解答
3/7*5/13-（9/14-3/14）*（-11/13）-3/7*3/13
=(5/13-3/13)*3/7-6/14*(-11/13)
=2/13*3/7+3/7*11/13
=(2/13+11/13)*3/7
=3/7
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