题目内容
下列各题,你认为怎样算简便就怎样算 8.54-1.26-4.74 |
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分析:(1)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质计算;
(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)可根据乘法分配律计算.
(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)可根据乘法分配律计算.
解答:解:(1)8.54-1.26-4.74
=8.54-(1.26+4.74),
=8.54-6,
=2.54;
(2)
-(
-
)÷
=
-
×4,
=
-
,
=
;
(3)
÷[(
-
)×
]
=
÷[
×
],
=
÷
,
=
;
(4)
÷23+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=8.54-(1.26+4.74),
=8.54-6,
=2.54;
(2)
4 |
5 |
2 |
7 |
1 |
5 |
1 |
4 |
=
4 |
5 |
3 |
35 |
=
4 |
5 |
12 |
35 |
=
16 |
35 |
(3)
5 |
36 |
1 |
2 |
1 |
6 |
5 |
9 |
=
5 |
36 |
1 |
3 |
5 |
9 |
=
5 |
36 |
5 |
27 |
=
3 |
4 |
(4)
8 |
17 |
1 |
23 |
9 |
17 |
=
8 |
17 |
1 |
23 |
1 |
23 |
9 |
17 |
=(
8 |
17 |
9 |
17 |
1 |
23 |
=1×
1 |
23 |
=
1 |
23 |
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法进行计算.
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