用递等式计算(能巧算的要巧算).(1)3956-(698+1956)(2)97+98+103+102(3)605-360÷12(4)56+19×23.-数学

题目简介

用递等式计算(能巧算的要巧算).(1)3956-(698+1956)(2)97+98+103+102(3)605-360÷12(4)56+19×23.-数学

题目详情

用递等式计算(能巧算的要巧算).
(1)3956-(698+1956)
(2)97+98+103+102
(3)605-360÷12
(4)56+19×23.
题型:解答题难度:中档来源:不详

答案

(1)3956-(698+1956),
=3956-1956-698,
=2000-698,
=1302;

(2)97+98+103+102,
=(97+103)+(98+102),
=200+200,
=400;

(3)605-360÷12,
=605-30,
=575;

(4)56+19×23,
=56+437,
=493.

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