题目内容
脱式计算.
144×3×5 | 300-86×3 | (84+116)×4 |
304+106×5 | 102×4×5 | 350+15×6. |
分析:(1)(5)按照从左到右的顺序计算;
(2)先算乘法,再算减法;
(3)先算小括号里面的加法,再算括号外的乘法;
(4)先算乘法,再算加法;
(6)先算乘法,再算加法.
(2)先算乘法,再算减法;
(3)先算小括号里面的加法,再算括号外的乘法;
(4)先算乘法,再算加法;
(6)先算乘法,再算加法.
解答:解:(1)144×3×5,
=432×5,
=2160;
(2)300-86×3,
=300-258,
=42;
(3)(84+116)×4,
=200×4,
=800;
(4)304+106×5,
=304+530,
=834;
(5)102×4×5,
=408×5,
=2040;
(6)350+15×6,
=350+90,
=440.
=432×5,
=2160;
(2)300-86×3,
=300-258,
=42;
(3)(84+116)×4,
=200×4,
=800;
(4)304+106×5,
=304+530,
=834;
(5)102×4×5,
=408×5,
=2040;
(6)350+15×6,
=350+90,
=440.
点评:解决本题要先理清楚运算顺序,然后根据运算顺序逐步求解即可.
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