题目内容
脱式计算
(98-23)÷5 | 16×4×20 | (11+17)×26 |
520-24×25 | 36×15-187 | 126÷2×33. |
分析:(1)先算小括号里面的减法,再算括号外的除法;
(2)按照从左到右的顺序计算;
(3)先算小括号里面的加法,再算括号外的乘法;
(4)先算乘法,再算减法;注意运算结果是负数;
(5)先算乘法,再算减法;
(6)按照从左到右的顺序计算.
(2)按照从左到右的顺序计算;
(3)先算小括号里面的加法,再算括号外的乘法;
(4)先算乘法,再算减法;注意运算结果是负数;
(5)先算乘法,再算减法;
(6)按照从左到右的顺序计算.
解答:解:(1)(98-23)÷5,
=75÷5,
=15;
(2)16×4×20,
=64×20,
=1280;
(3)(11+17)×26,
=28×26,
=728;
(4)520-24×25,
=520-600,
=-80;
(5)36×15-187,
=540-187,
=353;
(6)126÷2×33,
=63×33,
=2079.
=75÷5,
=15;
(2)16×4×20,
=64×20,
=1280;
(3)(11+17)×26,
=28×26,
=728;
(4)520-24×25,
=520-600,
=-80;
(5)36×15-187,
=540-187,
=353;
(6)126÷2×33,
=63×33,
=2079.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,根据运算顺序逐步求解即可.
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