题目内容
(2013?黄冈模拟)脱式计算下面各题.
(1)2700×(506-499)÷300
(2)33.02-(148.4-90.85)÷2.5
(3)(1÷1-1)÷2013
(4)18.1+(3-0.299÷0.23)×100.
(1)2700×(506-499)÷300
(2)33.02-(148.4-90.85)÷2.5
(3)(1÷1-1)÷2013
(4)18.1+(3-0.299÷0.23)×100.
分析:(1)先算括号内的,然后从左往右依次计算;
(2)先算括号内的,再算括号外的除法,最后算减法;
(3)先算括号内的除法,发现括号内的结果为0,于是本题最后结果为0;
(4)先算括号内的除法,再算括号内的减法,然后算括号外的乘法,最后算加法.
(2)先算括号内的,再算括号外的除法,最后算减法;
(3)先算括号内的除法,发现括号内的结果为0,于是本题最后结果为0;
(4)先算括号内的除法,再算括号内的减法,然后算括号外的乘法,最后算加法.
解答:解:(1)2700×(506-499)÷300,
=2700×7÷300,
=2700÷300×7,
=9×7,
=63;
(2)33.02-(148.4-90.85)÷2.5,
=33.02-57.55÷2.5,
=33.02-23.02,
=10;
(3)(1÷1-1)÷2013,
=(1-1)÷2013,
=0;
(4)18.1+(3-0.299÷0.23)×100,
=18.1+(3-1.3)×100,
=18.1+1.7×100,
=18.1+170,
=188.1.
=2700×7÷300,
=2700÷300×7,
=9×7,
=63;
(2)33.02-(148.4-90.85)÷2.5,
=33.02-57.55÷2.5,
=33.02-23.02,
=10;
(3)(1÷1-1)÷2013,
=(1-1)÷2013,
=0;
(4)18.1+(3-0.299÷0.23)×100,
=18.1+(3-1.3)×100,
=18.1+1.7×100,
=18.1+170,
=188.1.
点评:此题主要考查整数、小数的四则混合运算的运算顺序以及运算法则.
练习册系列答案
相关题目