作业帮1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
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![1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算](/uploads/image/z/599107-67-7.jpg?t=1.3%2F13-2%2F5%2B10%2F13-3%2F5+2.2%2F7%E9%99%A4%E4%BB%A5%5B3%2F7x%282%2F3%2B7%2F9%29%5D%EF%BC%88%2F%E6%98%AF%E5%88%86%E6%95%B0%E7%BA%BF%EF%BC%89%EF%BC%88%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%EF%BC%89%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）
简便运算
1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
1.3/13-2/5+10/13-3/5
=(3+10)/13-(2+3)/5
=1-1
=0
2.2/7除以[3/7x(2/3+7/9)]
=(2/7)除以[3/7x(6/9+7/9)]
=(2/7)除以[3/7x(13/9)]
=(2/7)除以[13/21]
=(2x21)/(7x13)
=6/13