题目内容
用你喜欢的方法计算.
(1)35.87×2.15-2.15×34.87-2.15
(2)42.56-(12.56-2.87)
(3)1.1×9×1.1+1.1×1.1
(4)35.4×44.2-35.3×44.3.
(1)35.87×2.15-2.15×34.87-2.15
(2)42.56-(12.56-2.87)
(3)1.1×9×1.1+1.1×1.1
(4)35.4×44.2-35.3×44.3.
分析:(1)(3)运用乘法分配律解答;
(2)运用减法性质解答;
(4)按照先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算即可解答.
(2)运用减法性质解答;
(4)按照先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算即可解答.
解答:解:(1)35.87×2.15-2.15×34.87-2.15,
=2.15×(35.87-34.87-1),
=2.15×0,
=0;
(2)42.56-(12.56-2.87),
=42.56-12.56+2.87,
=30+2.87,
=32.87;
(3)1.1×9×1.1+1.1×1.1,
=1.1×1.1×(9+1),
=1.21×10,
=12.1;
(4)35.4×44.2-35.3×44.3,
=1564.68-1563.79,
=0.89.
=2.15×(35.87-34.87-1),
=2.15×0,
=0;
(2)42.56-(12.56-2.87),
=42.56-12.56+2.87,
=30+2.87,
=32.87;
(3)1.1×9×1.1+1.1×1.1,
=1.1×1.1×(9+1),
=1.21×10,
=12.1;
(4)35.4×44.2-35.3×44.3,
=1564.68-1563.79,
=0.89.
点评:本题考查知识点:(1)选择并运用正确简便算法解决问题,(2)依据四则运算顺序正确进行计算.
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