roynal2002 春芽
共回答了22个问题采纳率:86.4% 举报
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.
点评:
本题考点: 小数的巧算.
考点点评: 此类型的题目可根据算式中加数的特点,采用凑数法进行巧算.
1年前
1.135+3.346+5.557+7.768+9.979=
1年前6个回答
1年前4个回答
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