题目内容
选择合理的方法计算:
÷10 | ×10× | ×÷ |
÷2÷ | 12×(+) | ×+×. |
解:(1)10=;
(2)×10×,
=15×,
=3×8,
=24;
(3)×÷,
=,
=;
(4)÷2÷,
=,
=;
(5)12×(+),
=12×+12×,
=8+2,
=10;
(6)×+×,
=()×,
=1×,
=.
分析:(1)(2)(3)(4)按照从左到右计算顺序解答,
(5)(6)运用乘法分配律解答.
点评:(1)四则运算计算顺序,(2)乘法分配律运用是解答本题的关键.
(2)×10×,
=15×,
=3×8,
=24;
(3)×÷,
=,
=;
(4)÷2÷,
=,
=;
(5)12×(+),
=12×+12×,
=8+2,
=10;
(6)×+×,
=()×,
=1×,
=.
分析:(1)(2)(3)(4)按照从左到右计算顺序解答,
(5)(6)运用乘法分配律解答.
点评:(1)四则运算计算顺序,(2)乘法分配律运用是解答本题的关键.
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