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题目
计算 1.135+3.346+5.557+7.768+9.979=______.

提问时间:2021-02-08

答案
1.135+3.346+5.557+7.768+9.979,
=1.135+3.346+5.557+(5.557+2.211)+(5.557+4.422),
=1.135+3.346+5.557+5.557+2.211+5.557+4.422,
=(1.135+4.422)+(3.346+2.211)+5.557+5.557+5.557,
=5.557+5.557+5.557+5.557+5.557,
=5.557×5,
=27.785;
故答案为:27.785.
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