题目内容
比一比,算一算.
(75+15)×28-14
1500÷25-(18+8)
(28+32)÷(4-3)
(75+15)×28-14
=2506
=2506
,75+15×28-14=481
=481
;1500÷25-(18+8)
=34
=34
,1500÷(25-18+8)=100
=100
;(28+32)÷(4-3)
=60
=60
,28+(32÷4-3)=33
=33
.分析:根据四则混合运算的计算顺序:先算二级运算,再算一级运算,有括号的要先算括号里面的.据此解答.
解答:解:(1)(75+15)×28-14,
=90×28-14,
=2520-14,
=2506;
(2)75+15×28-14,
=75+420-14,
=481;
(3)1500÷25-(18+8),
=1500÷25-26,
=60-26,
=34;
(4)1500÷(25-18+8),
=1500÷15,
=100;
(5)(28+32)÷(4-3),
=60÷1,
=60;
(6)28+(32÷4-3),
=28+(8-3),
=28+5,
=33.
=90×28-14,
=2520-14,
=2506;
(2)75+15×28-14,
=75+420-14,
=481;
(3)1500÷25-(18+8),
=1500÷25-26,
=60-26,
=34;
(4)1500÷(25-18+8),
=1500÷15,
=100;
(5)(28+32)÷(4-3),
=60÷1,
=60;
(6)28+(32÷4-3),
=28+(8-3),
=28+5,
=33.
点评:本题主要考查了学生对计算顺序知识的掌握情况,同样的运算符号和数字,运算顺序不同结果不一样.
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