题目内容
脱式计算,能简算的就简算.
[1-(
+
)]÷
(
-
)÷(2-
)
(
+
)×25×144.
[1-(
3 |
10 |
3 |
5 |
4 |
5 |
(
11 |
12 |
3 |
4 |
1 |
2 |
(
3 |
25 |
7 |
144 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里的加法,再算中括号里的减法,最后算中括号外边的除法;
(2)同时计算小括号里的两个减法,再算外面的除法;
(3)根据乘法的分配律简算.
(2)同时计算小括号里的两个减法,再算外面的除法;
(3)根据乘法的分配律简算.
解答:
解:(1)[1-(
+
)]÷
=[1-
]÷
=
×
=
(2)(
-
)÷(2-
)
=
×
=
(3)(
+
)×25×144
=
×25×144+
×25×144
=3×144+7×25
=432+175
=607
3 |
10 |
3 |
5 |
4 |
5 |
=[1-
9 |
10 |
4 |
5 |
=
1 |
10 |
5 |
4 |
=
1 |
8 |
(2)(
11 |
12 |
3 |
4 |
1 |
2 |
=
1 |
6 |
2 |
3 |
=
1 |
9 |
(3)(
3 |
25 |
7 |
144 |
=
3 |
25 |
7 |
144 |
=3×144+7×25
=432+175
=607
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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