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脱式计算.455÷[(109-102)×13];450÷(100-350÷7)];425-[(228+375)-168]÷15;351-(168-88)×4.

题目详情
脱式计算.
455÷[(109-102)×13];
450÷(100-350÷7)];
425-[(228+375)-168]÷15;
351-(168-88)×4.
▼优质解答
答案和解析
(1)455÷[(109-102)×13]
=455÷[7×13]
=455÷91
=5;

(2)450÷(100-350÷7)
=450÷(100-50)
=450÷50
=9;

(3)425-[(228+375)-168]÷15
=425-[603-168]÷15
=425-435÷15
=425-29
=396;

(4)351-(168-88)×4
=351-80×4
=351-320
=31.