题目内容
(2012?佛山)计算,能简算的要简算.
(
|
1÷[(
|
12.5-
|
25×125×32. |
分析:(1)运用乘法分配律简算;
(2)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法;
(3)根据减法的性质简算;
(4)先把32分解成8×4,再运用乘法结合律简算.
(2)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法;
(3)根据减法的性质简算;
(4)先把32分解成8×4,再运用乘法结合律简算.
解答:解:(1)(
+
)×24,
=24×
+
×24,
=9+2,
=11;
(2)1÷[(
+
)÷
],
=1÷(
÷
),
=1÷2,
=
;
(3)12.5-
-0.625,
=12.5-(0.375+0.625),
=12.5-1,
=11.5;
(4)25×125×32,
=25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000.
3 |
8 |
1 |
12 |
=24×
3 |
8 |
1 |
12 |
=9+2,
=11;
(2)1÷[(
1 |
3 |
1 |
2 |
5 |
12 |
=1÷(
5 |
6 |
5 |
12 |
=1÷2,
=
1 |
2 |
(3)12.5-
3 |
8 |
=12.5-(0.375+0.625),
=12.5-1,
=11.5;
(4)25×125×32,
=25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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