题目内容
下面各题怎样计算简便就怎样算
705+698+703+701+697+693
÷[
-(
+
)]
×26+
÷
(
+
)×
+
.
705+698+703+701+697+693
| 1 |
| 4 |
| 7 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 26 |
(
| 24 |
| 29 |
| 16 |
| 19 |
| 1 |
| 8 |
| 17 |
| 19 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:①705+698+703+701+697+693 根据加法的运算性质,把每个加数看作700,少加几再加上几多加几再减去几.
②
÷[
-(
+
)],先算小括号里面的加法,再算中括号里面的减法,最后算除法.
③
×26+
÷
,把除数转化为乘它的倒数,再运用乘法分配律简算.
④(
+
)×
+
,运用乘法分配律简算.
②
| 1 |
| 4 |
| 7 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
③
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 26 |
④(
| 24 |
| 29 |
| 16 |
| 19 |
| 1 |
| 8 |
| 17 |
| 19 |
解答:
解:①705+698+703+701+697+693
=700+700+700+700+700+700+(5+3+1-2-3-7)
=700×6-3
=4200-3
=4197;
②
÷[
-(
+
)]
=
÷[
-
]
=
÷
=1;
③
×26+
÷
=(
+
)×26
=1×26
=26;
④(
+
)×
+
=
×
+
×
+
=
+(
+
)
=
+1
=1
.
=700+700+700+700+700+700+(5+3+1-2-3-7)
=700×6-3
=4200-3
=4197;
②
| 1 |
| 4 |
| 7 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 7 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=1;
③
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 26 |
=(
| 3 |
| 5 |
| 2 |
| 5 |
=1×26
=26;
④(
| 24 |
| 29 |
| 16 |
| 19 |
| 1 |
| 8 |
| 17 |
| 19 |
=
| 24 |
| 29 |
| 1 |
| 8 |
| 16 |
| 19 |
| 1 |
| 8 |
| 17 |
| 19 |
=
| 3 |
| 29 |
| 2 |
| 19 |
| 17 |
| 19 |
=
| 3 |
| 29 |
=1
| 3 |
| 29 |
点评:此题考查的目的是理解掌握整数、分数四则混合运算的顺序以及它们的计算法则,并且能够灵活选择简便方法进行计算.
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