题目内容
用简便的方法计算.
(+)×24
108-63.58-36.42
8×0.4×12.5×2.5.
解:(1)(+)×24,
=24+24,
=8+6,
=14;
(2)108-63.58-36.42,
=108-(63.58+36.42),
=108-100,
=8;
(3)8×0.4×12.5×2.5,
=(8×12.5)×(0.4×2.5),
=100×1,
=100.
分析:(1)运用乘法分配律解答;
(2)依据减法性质解答;
(3)运用乘法交换律和结合律解答.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
=24+24,
=8+6,
=14;
(2)108-63.58-36.42,
=108-(63.58+36.42),
=108-100,
=8;
(3)8×0.4×12.5×2.5,
=(8×12.5)×(0.4×2.5),
=100×1,
=100.
分析:(1)运用乘法分配律解答;
(2)依据减法性质解答;
(3)运用乘法交换律和结合律解答.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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