题目内容
(2013?巴中)脱式计算
1375+450÷18×25 | [2-(
|
3.45-(4.75-0.55×4) |
分析:(1)先算除法和乘法,再算加法;
(2)先算小括号内的,再算中括号内的除法,然后算中括号内的减法,最后算括号外的乘法;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的减法.
(2)先算小括号内的,再算中括号内的除法,然后算中括号内的减法,最后算括号外的乘法;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的减法.
解答:解:(1)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;
(2)[2-(
-
)÷
]×
,
=[2-
×
]×
,
=[2-
]×
,
=
×
,
=12;
(3)3.45-(4.75-0.55×4),
=3.45-(4.75-2.2),
=3.45-2.55,
=0.9.
=1375+25×25,
=1375+625,
=2000;
(2)[2-(
5 |
3 |
3 |
2 |
17 |
12 |
51 |
8 |
=[2-
1 |
6 |
12 |
17 |
51 |
8 |
=[2-
2 |
17 |
51 |
8 |
=
32 |
17 |
51 |
8 |
=12;
(3)3.45-(4.75-0.55×4),
=3.45-(4.75-2.2),
=3.45-2.55,
=0.9.
点评:此题考查了四则混合运算,凡是脱式计算,就要特别注意运算顺序和运算法则.
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