题目内容
计算下列各题
×1.4×34= | (0.25+75%)÷= |
(15-36×)÷125= | (37-25%÷0.25)×= |
解:(1)×1.4×34,
=0.2×34,
=6.8;
(2)(0.25+75%)÷,
=(0.25+0.75)÷,
=1×,
=;
(3)(15-36×)÷125,
=(15-8)÷125,
=7÷125,
=;
(4)(37-25%÷0.25)×,
=(37-1)×,
=36×,
=21.
分析:(1)7与1.4约分,用所得的结果乘34即可;
(2)把75%化成小数,先算括号内的,再算括号外的;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)先算括号内的除法,再算括号内的减法,最后算括号外的乘法,.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则以及数字转化.
=0.2×34,
=6.8;
(2)(0.25+75%)÷,
=(0.25+0.75)÷,
=1×,
=;
(3)(15-36×)÷125,
=(15-8)÷125,
=7÷125,
=;
(4)(37-25%÷0.25)×,
=(37-1)×,
=36×,
=21.
分析:(1)7与1.4约分,用所得的结果乘34即可;
(2)把75%化成小数,先算括号内的,再算括号外的;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)先算括号内的除法,再算括号内的减法,最后算括号外的乘法,.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则以及数字转化.
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