题目内容
说一说下面各题的运算顺序,再计算. 142+31×4 | 200-56×3 | 453+182÷7 | 560-560÷8 |
34×12-230 | 56×6+114 | 480÷(24+36) | 216-(120+36) |
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)(6)先算乘法,再算加法;
(2)(5)先算乘法,再算减法;
(3)先算除法,再算加法;
(4)先算除法,再算减法;
(7)先算加法,再算除法;
(8)利用减法的性质简算.
(2)(5)先算乘法,再算减法;
(3)先算除法,再算加法;
(4)先算除法,再算减法;
(7)先算加法,再算除法;
(8)利用减法的性质简算.
解答:
解:(1)142+31×4
=142+124
=266;
(2)200-56×3
=200-168
=32;
(3)453+182÷7
=453+26
=479;
(4)560-560÷8
=560-70
=490;
(5)34×12-230
=408-230
=178;
(6)56×6+114
=336+114
=450;
(7)480÷(24+36)
=480÷60
=8;
(8)216-(120+36)
=216-36-120
=180-120
=60.
=142+124
=266;
(2)200-56×3
=200-168
=32;
(3)453+182÷7
=453+26
=479;
(4)560-560÷8
=560-70
=490;
(5)34×12-230
=408-230
=178;
(6)56×6+114
=336+114
=450;
(7)480÷(24+36)
=480÷60
=8;
(8)216-(120+36)
=216-36-120
=180-120
=60.
点评:整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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