题目内容
2.简便计算①65+24+6 | ②32+25+8 | ③78+16+4 | ④46+7+23 |
⑤75+46+25+54 | ⑥11+15+9+5 | ⑦36+48+64+52 |
分析 ①③④运用加法结合律可简算;
②⑤⑥⑦运用加法交换律和结合律可简算.
解答 解:①65+24+6
=65+(24+6)
=65+30
=95
②32+25+8
=(32+8)+25
=40+25
=65
③78+16+4
=78+(16+4)
=78+20
=98
④46+7+23
=46+(7+23)
=46+30
=76
⑤75+46+25+54
=(75+25)+(46+54)
=100+100
=200
⑥11+15+9+5
=(11+9)+(15+5)
=20+20
=40
⑦36+48+64+52
=(36+64)+(48+52)
=100+100
=200
点评 此题考查整数四则混合运算顺序和灵活运用运算定律,分析数据找到正确的计算方法.
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