13.5-(6.9+6.1)÷2.615×573+900÷36×15()÷+.
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解:(1)13.5-(6.9+6.1)÷2.6,
=13.5-13÷2.6,
=13.5-5,
=8.5;
(2)15×,
=3××,
=2×,
=;
(3)573+900÷36×15,
=573+25×15,
=573+375,
=948;
(4)()÷+,
=×+,
=+,
=.
解析分析:(1)先算小括号里面的加法,再算括号外的除法,最后算减法;
(2)按照从左到右的顺序计算;
(3)先算除法,再算乘法,最后算加法;
(4)先算小括号里面的加法,再算括号外的除法,最后算加法.
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.