题目内容
递等式计算
(1)(2201-125×4)÷81
(2)462-29×13+85
(3)4.5+8.47-7.9
(4)37×25+175÷25.
(1)(2201-125×4)÷81
(2)462-29×13+85
(3)4.5+8.47-7.9
(4)37×25+175÷25.
分析:(1)按照先算括号里面的乘法,再算括号里面的减法,最后算括号外面的顺序解答;
(2)按照先算乘法,再从左到右顺序解答;
(3)按照从左到右顺序解答;
(4)按照先同时计算乘法和除法,再算加法顺序解答.
(2)按照先算乘法,再从左到右顺序解答;
(3)按照从左到右顺序解答;
(4)按照先同时计算乘法和除法,再算加法顺序解答.
解答:解:(1)(2201-125×4)÷81
=(2201-500)÷81
=1701÷81
=21;
(2)462-29×13+85
=462-377+85
=85+85
=170;
(3)4.5+8.47-7.9
=12.97-7.9
=5.07;
(4)37×25+175÷25
=925+7
=932.
=(2201-500)÷81
=1701÷81
=21;
(2)462-29×13+85
=462-377+85
=85+85
=170;
(3)4.5+8.47-7.9
=12.97-7.9
=5.07;
(4)37×25+175÷25
=925+7
=932.
点评:依据四则运算顺序正确进行计算,是本题考查知识点.
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