题目内容
怎样算简便就怎样算
425÷(155-130) | (765-230)×45 | 109+127+73 |
608-154-146 | 165-97 | 258+98. |
解:(1)425÷(155-130),
=425÷25,
=17;
(2)(765-230)×45,
=535×45,
=24075;
(3)109+127+73,
=109+(127+73),
=109+200,
=309;
(4)608-154-146,
=608-(154+146),
=608-300,
=308;
(5)165-97,
=165-(100-3),
=165-100+3,
=65+3,
=68;
(6)258+98,
=258+(100-2),
=258+100-2,
=358-2,
=356.
分析:(1)先算括号里的减法,再算括号外的除法;
(2)先算括号里的减法,再算括号外的乘法;
(3)根据加法的运算性质进行简算;
(4)根据减法的运算性质进行简算;
(5)165-97化成165-100+3,进行简便计算;
(6)258+98化成258+100-2,再进行简算;
点评:此题主要考查整数四则混合运算,要注意分析,运用合适的简便方法计算.
=425÷25,
=17;
(2)(765-230)×45,
=535×45,
=24075;
(3)109+127+73,
=109+(127+73),
=109+200,
=309;
(4)608-154-146,
=608-(154+146),
=608-300,
=308;
(5)165-97,
=165-(100-3),
=165-100+3,
=65+3,
=68;
(6)258+98,
=258+(100-2),
=258+100-2,
=358-2,
=356.
分析:(1)先算括号里的减法,再算括号外的除法;
(2)先算括号里的减法,再算括号外的乘法;
(3)根据加法的运算性质进行简算;
(4)根据减法的运算性质进行简算;
(5)165-97化成165-100+3,进行简便计算;
(6)258+98化成258+100-2,再进行简算;
点评:此题主要考查整数四则混合运算,要注意分析,运用合适的简便方法计算.
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