题目内容
(2013?六合区模拟)看谁都能算对!(能简算的请写出简算过程)
624-3.2×1.5÷0.1 | 9.43+0.78-2.43 | ||||||||||||||
|
|
分析:(1)先算乘法,再算除法,最后算减法,
(2)先算9.43-2.43,再算加法,
(3)先算小括号里的加法,再算在括号里的除法,最后算括号外的减法,
(4)运用乘法的分配律进行简算.
(2)先算9.43-2.43,再算加法,
(3)先算小括号里的加法,再算在括号里的除法,最后算括号外的减法,
(4)运用乘法的分配律进行简算.
解答:解:(1)624-3.2×1.5÷0.1,
=624-4.8÷0.1,
=624-48,
=576;
(2)9.43+0.78-2.43,
=9.43-2.43+0.78,
=7+0.78,
=7.78;
(3)
-[(
+
)÷
],
=
-[
÷
],
=
-
,
=
;
(4)
×5+
÷
,
=
×5+
×5,
=(
+
)×5,
=1×5,
=5.
=624-4.8÷0.1,
=624-48,
=576;
(2)9.43+0.78-2.43,
=9.43-2.43+0.78,
=7+0.78,
=7.78;
(3)
5 |
6 |
1 |
5 |
1 |
3 |
8 |
9 |
=
5 |
6 |
8 |
15 |
8 |
9 |
=
5 |
6 |
3 |
5 |
=
7 |
30 |
(4)
16 |
27 |
11 |
27 |
1 |
5 |
=
16 |
27 |
11 |
27 |
=(
16 |
27 |
11 |
27 |
=1×5,
=5.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,然后根据运算定律逐进行计算.
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