题目内容

1800-60×3 540÷9-45 960-240÷8
100-25×4 (150+300)÷5 630÷(55-46)
分析:(1)(4)先算乘法,再算减法;
(2)(3)先算除法,再算减法;
(5)先算小括号里面的加法,再算括号外的除法;
(6)先算小括号里面的减法,再算括号外的除法.
解答:解:(1)1800-60×3,
=1800-180,
=1620;

(2)540÷9-45,
=60-45,
=15;

(3)960-240÷8,
=960-30,
=930;

(4)100-25×4,
=100-100,
=0;

(5)(150+300)÷5,
=450÷5,
=90;

(6)630÷(55-46),
=630÷9,
=70.
点评:解决本题关键是理清楚运算顺序,根据运算顺序逐步求解即可.
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