用简便方法计算:73+3.4+27+5.6 7.25-3.42-1.58 ...
答案:1 悬赏:0 手机版
解决时间 2021-02-12 00:47
- 提问者网友:雨不眠的下
- 2021-02-11 19:22
用简便方法计算:73+3.4+27+5.6 7.25-3.42-1.58 ...
最佳答案
- 五星知识达人网友:一叶十三刺
- 2021-02-11 19:41
解;①73+3.4+27+5.6
=(73+27)+(3.4+5.6)
=100+9
=109;
②7.25-3.42-1.58
=7.25-(3.42+1.58)
=7.25-5
=2.25;
③29.38-(19.38-4.76)
=29.38-19.38+4.76
=10+4.76
=14.76;
④363×7+237×7
=(363+237)×7
=600×7
=4200;
⑤4300÷25÷4
=4300÷(25×4)
=4300÷100
=43;
⑥78×101
=78×(100+1)
=78×100+78×1
=7800+78
=7878.
=(73+27)+(3.4+5.6)
=100+9
=109;
②7.25-3.42-1.58
=7.25-(3.42+1.58)
=7.25-5
=2.25;
③29.38-(19.38-4.76)
=29.38-19.38+4.76
=10+4.76
=14.76;
④363×7+237×7
=(363+237)×7
=600×7
=4200;
⑤4300÷25÷4
=4300÷(25×4)
=4300÷100
=43;
⑥78×101
=78×(100+1)
=78×100+78×1
=7800+78
=7878.
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