题目内容
脱式计算.
48÷8×12 | (75+25)×4 | 25×4×6 |
170×3-500 | 28×5×2 | 789-26×3. |
解:(1)48÷8×12,
=6×12,
=72;
(2)(75+25)×4,
=75×4+25×4,
=300+100,
=400;
(3)25×4×6,
=100×6,
=600;
(4)170×3-500,
=510-500,
=10;
(5)28×5×2,
=140×2,
=280;
(6)789-26×3,
=789-78,
=711.
分析:(1)(3)(4)(5)(6)依据整数四则运算计算顺序解答,
(2)运用乘法分配律解答.
点评:本题考查知识点(1)整数四则运算计算方法,(2)乘法分配律运用.
=6×12,
=72;
(2)(75+25)×4,
=75×4+25×4,
=300+100,
=400;
(3)25×4×6,
=100×6,
=600;
(4)170×3-500,
=510-500,
=10;
(5)28×5×2,
=140×2,
=280;
(6)789-26×3,
=789-78,
=711.
分析:(1)(3)(4)(5)(6)依据整数四则运算计算顺序解答,
(2)运用乘法分配律解答.
点评:本题考查知识点(1)整数四则运算计算方法,(2)乘法分配律运用.
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