题目内容
用递等式计算.
(1)35×(76-59)-159
(2)1519-(14+17)×24
(3)890-608+(79-47)
(4)(387+525)÷(89-65)
(1)35×(76-59)-159
(2)1519-(14+17)×24
(3)890-608+(79-47)
(4)(387+525)÷(89-65)
分析:(1)(2)按照先算括号里面的,再算第二级运算,最后算第一级运算的顺序即可解答;
(3)按照先算括号里面的,再从左到右顺序计算即可解答;
(4)按照先同时计算括号里面的,再算除法的顺序即可解答.
(3)按照先算括号里面的,再从左到右顺序计算即可解答;
(4)按照先同时计算括号里面的,再算除法的顺序即可解答.
解答:解:(1)35×(76-59)-159,
=35×17-159,
=595-159,
=436;
(2)1519-(14+17)×24,
=1519-31×24,
=1519-744,
=775;
(3)890-608+(79-47),
=890-606+32,
=284+32,
=316;
(4)(387+525)÷(89-65),
=912÷24,
=38.
=35×17-159,
=595-159,
=436;
(2)1519-(14+17)×24,
=1519-31×24,
=1519-744,
=775;
(3)890-608+(79-47),
=890-606+32,
=284+32,
=316;
(4)(387+525)÷(89-65),
=912÷24,
=38.
点评:(1)明确计算的顺序,(2)计算结果要准确,是本题考查知识点.
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