题目内容
(2008?北塘区)
14×70-624÷6 | 32×0.125×2.5 |
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(
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分析:(1)先算乘除,再算减法;
(2)把32看作4×8,运用乘法交换律与结合律简算;
(3)运用减法的性质简算;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
(2)把32看作4×8,运用乘法交换律与结合律简算;
(3)运用减法的性质简算;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)14×70-624÷6,
=980-104,
=876;
(2)32×0.125×2.5,
=4×8×0.125×2.5,
=8×0.125×(4×2.5),
=1×10,
=10;
(3)
-
-
,
=
-(
+
),
=
-2,
=
;
(4)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(5)(
+
×
)÷
,
=(
+
)×
,
=
×
,
=1;
(6)
÷[
-(1-
)],
=
÷[
-
],
=
÷
,
=
×10,
=
.
=980-104,
=876;
(2)32×0.125×2.5,
=4×8×0.125×2.5,
=8×0.125×(4×2.5),
=1×10,
=10;
(3)
14 |
5 |
1 |
3 |
5 |
3 |
=
14 |
5 |
1 |
3 |
5 |
3 |
=
14 |
5 |
=
4 |
5 |
(4)
5 |
7 |
4 |
7 |
1 |
9 |
=
5 |
7 |
1 |
9 |
4 |
7 |
1 |
9 |
=(
5 |
7 |
4 |
7 |
1 |
9 |
=
9 |
7 |
1 |
9 |
=
1 |
7 |
(5)(
2 |
3 |
5 |
7 |
7 |
24 |
7 |
8 |
=(
2 |
3 |
5 |
24 |
8 |
7 |
=
7 |
8 |
8 |
7 |
=1;
(6)
7 |
11 |
2 |
5 |
7 |
10 |
=
7 |
11 |
2 |
5 |
3 |
10 |
=
7 |
11 |
1 |
10 |
=
7 |
11 |
=
70 |
11 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.

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