题目内容
(2008?南海区)计算下列各题(能简算的写出简算过程)
4.6×
+4.4÷1
+(1-0.1)
1110÷[56×(
-
)].
4.6×
9 |
10 |
1 |
9 |
1110÷[56×(
3 |
7 |
3 |
8 |
分析:(1)把小数化为分数,运用乘法分配律简算;
(2)中括号内运用乘法分配律简算,然后再算括号外的除法.
(2)中括号内运用乘法分配律简算,然后再算括号外的除法.
解答:解:(1)4.6×
+4.4÷1
+(1-0.1),
=
×
+
×
+0.9,
=(
+
+1)×
,
=10×
,
=9;
(2)1110÷[56×(
-
)],
=1110÷[56×
-56×
],
=1110÷[24-21],
=1110÷3,
=370.
9 |
10 |
1 |
9 |
=
23 |
5 |
9 |
10 |
22 |
5 |
9 |
10 |
=(
23 |
5 |
22 |
5 |
9 |
10 |
=10×
9 |
10 |
=9;
(2)1110÷[56×(
3 |
7 |
3 |
8 |
=1110÷[56×
3 |
7 |
3 |
8 |
=1110÷[24-21],
=1110÷3,
=370.
点评:此题主要考查分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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