题目内容
计算. 200×3+8= |
60×4+75= |
50×6-300= |
90×4-40= |
35÷5-5= |
560-(20+170)= | 288×0+377= | 48÷8+20= | 108×3+37= |
分析:(1)(2)(7)(9)先算乘法,再算加法;
(3)(4)先算乘法,再算减法;
(5)先算除法,再算减法;
(6)先算小括号里面的加法,再算括号外的减法;
(8)先算除法,再算加法.
(3)(4)先算乘法,再算减法;
(5)先算除法,再算减法;
(6)先算小括号里面的加法,再算括号外的减法;
(8)先算除法,再算加法.
解答:解:(1)200×3+8,
=600+8,
=608;
(2)60×4+75,
=240+75,
=315;
(3)50×6-300
=300-300,
=0;
(4)90×4-40,
=360-40,
=320;
(5)35÷5-5,
=7-5,
=2;
(6)560-(20+170),
=560-190,
=370;
(7)288×0+377,
=0+377,
=377;
(8)48÷8+20,
=6+20,
=26;
(9)108×3+37,
=324+37,
=361.
=600+8,
=608;
(2)60×4+75,
=240+75,
=315;
(3)50×6-300
=300-300,
=0;
(4)90×4-40,
=360-40,
=320;
(5)35÷5-5,
=7-5,
=2;
(6)560-(20+170),
=560-190,
=370;
(7)288×0+377,
=0+377,
=377;
(8)48÷8+20,
=6+20,
=26;
(9)108×3+37,
=324+37,
=361.
点评:1.一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算.2.一个算式里,如果有小括号,要先算小括号里的.
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