题目内容

计算下面各题,能用简便方法的要用简便方法计算.
(1)
44
9
×
3
8
×
6
11
(2)
3
4
+
3
4
÷
1
7
(3)35×(
4
7
-
2
5
)
(4)
4
5
÷(3-
4
15
-
11
15
)
(5)(0.75-
3
16
)×(
2
9
+
1
3
)
(6)
6
7
-
6
7
÷6
分析:(1)根据乘法交换律进行计算;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算
(4)根据连减的性质进行计算;
(5)先算减法和加法,再算乘法;
(6)先算除法,再算减法.
解答:解:
(1)
44
9
×
3
8
×
6
11

=
44
9
×
6
11
×
3
8

=
8
3
×
3
8

=1;

(2)
3
4
+
3
4
÷
1
7

=5×
3
4
+
3
4
×7,
=(5+7)×
3
4

=12×
3
4

=9;

(3)35×(
4
7
-
2
5
)

=35×
4
7
-35×
2
5

=20-14,
=6;

(4)
4
5
÷(3-
4
15
-
11
15
)

=
4
5
÷[3-(
4
15
+
11
15
)],
=
4
5
÷[3-1],
=
4
5
÷2,
=
2
5


(5)(0.75-
3
16
)×(
2
9
+
1
3
)

=
9
16
×
5
9

=
5
16


(6)
6
7
-
6
7
÷6

=7-
1
7

=6
6
7
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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