题目内容
①4.68-0.18-0.82 | ②2-- | ③2÷-× |
④90×+36÷9 | ⑤7.28-(0.25+1.28) | ⑥25÷(+)+12.5. |
解:①4.68-0.18-0.82,
=4.68-(0.18+0.82 ),
=4.68-1,
=3.68;
②2--,
=1,
=1;
③2÷-×,
=3-,
=2;
④90×+36÷9,
=60+4,
=64;
⑤7.28-(0.25+1.28),
=7.28-0.25-1.28,
=7.28-1.28-0.25,
=6-0.25,
=5.75;
⑥25÷(+)+12.5,
=25÷2+12.5,
=12.5+12.5,
=25.
分析:①运用减法的性质进行解答即可,
②从左向右进行计算即可,
③先分别求出乘法算式和乘法算式,再算减法,
④先分别求出乘法算式和乘法算式,再算加法,
⑤先去括号,先减1.28,再减去0.25,
⑥先算小括号里的加法,再算除法,最后算加法.
点评:此题重点考查学生的运算技巧,要想达到简算的目的,必须熟练掌握运算定律.
=4.68-(0.18+0.82 ),
=4.68-1,
=3.68;
②2--,
=1,
=1;
③2÷-×,
=3-,
=2;
④90×+36÷9,
=60+4,
=64;
⑤7.28-(0.25+1.28),
=7.28-0.25-1.28,
=7.28-1.28-0.25,
=6-0.25,
=5.75;
⑥25÷(+)+12.5,
=25÷2+12.5,
=12.5+12.5,
=25.
分析:①运用减法的性质进行解答即可,
②从左向右进行计算即可,
③先分别求出乘法算式和乘法算式,再算减法,
④先分别求出乘法算式和乘法算式,再算加法,
⑤先去括号,先减1.28,再减去0.25,
⑥先算小括号里的加法,再算除法,最后算加法.
点评:此题重点考查学生的运算技巧,要想达到简算的目的,必须熟练掌握运算定律.
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