题目内容
计算下面各题,怎样计算简便就怎样计算. 888+999×888= |
12.5×32×0.25= | ||||||||||||||||||||
3-
|
|
分析:(1)运用乘法分配律解答,
(2)化32-8×4,再运用乘法结合律解答,
(3)按照先算除法,再运用减法性质解答,
(4)(5)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答.
(2)化32-8×4,再运用乘法结合律解答,
(3)按照先算除法,再运用减法性质解答,
(4)(5)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答.
解答:解:(1)888+999×888
=888×(999+1)
=888×1000
=888000;
(2)12.5×32×0.25
=(12.5×8)×(4×0.25)
=100×10
=1000;
(3)3-
÷
-
=3-(
+
)
=3-1
=2;
(4)
×[
÷(
+
)]
=
×[
÷
]
=
×
=
;
(5)
÷[1-(
-
)]
=
÷[1-
]
=
÷
=
.
=888×(999+1)
=888×1000
=888000;
(2)12.5×32×0.25
=(12.5×8)×(4×0.25)
=100×10
=1000;
(3)3-
5 |
8 |
25 |
28 |
3 |
10 |
=3-(
7 |
10 |
3 |
10 |
=3-1
=2;
(4)
4 |
5 |
13 |
16 |
3 |
4 |
1 |
3 |
=
4 |
5 |
13 |
16 |
5 |
6 |
=
4 |
5 |
39 |
40 |
=
39 |
50 |
(5)
7 |
15 |
4 |
5 |
2 |
3 |
=
7 |
15 |
2 |
15 |
=
7 |
15 |
13 |
15 |
=
7 |
13 |
点评:本题考查知识点:(1)运用乘法分配律解决问题,(2)依据四则运算计算方法正确进行计算.
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