题目内容
计算,能简算的要简算
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考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)根据乘法交换律和结合律进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再算除法;
(5)先算乘法和除法,再算加法;
(6)先算减法,再算中括号里面的除法,最后算括号外面的除法.
(2)根据乘法交换律和结合律进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再算除法;
(5)先算乘法和除法,再算加法;
(6)先算减法,再算中括号里面的除法,最后算括号外面的除法.
解答:
解:(1)(
-
+
)÷
=(
-
+
)×36
=
×36-
×36+
×36
=34-27+6
=7+6
=13;
(2)
×12×
×16
=(
×16)×(12×
)
=5×9
=45;
(3)
÷8+
×
=
×
+
×
=(
+
)×
=1×
=
;
(4)
÷(
+
)
=
÷
=
;
(5)
×
+
÷
=
+
=
;
(6)
÷[(
-
)÷
]
=
÷[
÷
]
=
÷
=4.
17 |
18 |
3 |
4 |
1 |
6 |
1 |
36 |
=(
17 |
18 |
3 |
4 |
1 |
6 |
=
17 |
18 |
3 |
4 |
1 |
6 |
=34-27+6
=7+6
=13;
(2)
5 |
16 |
3 |
4 |
=(
5 |
16 |
3 |
4 |
=5×9
=45;
(3)
2 |
3 |
1 |
3 |
1 |
8 |
=
2 |
3 |
1 |
8 |
1 |
3 |
1 |
8 |
=(
2 |
3 |
1 |
3 |
1 |
8 |
=1×
1 |
8 |
=
1 |
8 |
(4)
9 |
16 |
3 |
8 |
1 |
16 |
=
9 |
16 |
7 |
16 |
=
9 |
7 |
(5)
4 |
5 |
5 |
6 |
2 |
5 |
3 |
5 |
=
2 |
3 |
2 |
3 |
=
4 |
3 |
(6)
4 |
5 |
5 |
8 |
1 |
2 |
5 |
8 |
=
4 |
5 |
1 |
8 |
5 |
8 |
=
4 |
5 |
1 |
5 |
=4.
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定律简便计算.
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