题目内容
脱式计算,能简算的要简算.
1-
-
-
+
1
+4.35+3
-2
+
-
+
-
-(
+
)
1-
| 7 |
| 10 |
| 1 |
| 5 |
| 3 |
| 4 |
| 7 |
| 8 |
| 5 |
| 24 |
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 20 |
| 7 |
| 12 |
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 6 |
考点:分数的加法和减法,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:①②⑤通分后计算;
③④运用加法交换律简算;
⑥运用减法的性质计算后再通分计算.
③④运用加法交换律简算;
⑥运用减法的性质计算后再通分计算.
解答:
解:①1-
-
=
-
-
=
;
②
-
+
=
-
+
=
;
③1
+4.35+3
-2
=1
+3
+(4.35-2
)
=4
+2
=6
;
④
+
-
=
-
+
=
;
⑤
+
-
=
+
-
=
;
⑥
-(
+
)
=
-
-
=
-
=
-
=
.
| 7 |
| 10 |
| 1 |
| 5 |
=
| 10 |
| 10 |
| 7 |
| 10 |
| 2 |
| 10 |
=
| 1 |
| 10 |
②
| 3 |
| 4 |
| 7 |
| 8 |
| 5 |
| 24 |
=
| 18 |
| 24 |
| 21 |
| 24 |
| 5 |
| 24 |
=
| 1 |
| 12 |
③1
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 20 |
=1
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 20 |
=4
| 4 |
| 5 |
=6
| 4 |
| 5 |
④
| 7 |
| 12 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 7 |
| 12 |
| 7 |
| 12 |
| 5 |
| 6 |
=
| 5 |
| 6 |
⑤
| 7 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 14 |
| 18 |
| 15 |
| 18 |
| 3 |
| 18 |
=
| 13 |
| 9 |
⑥
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 6 |
=
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 12 |
| 2 |
| 12 |
=
| 1 |
| 12 |
点评:此题考查的目的是理解掌握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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