题目内容
计算:(能简算的要简算)
(
| 3060÷15-2.5×1.04 | ||||||||||||
15.6÷4-5.6×
|
| ||||||||||||
|
|
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:①(
+
)×9+
,运用乘法分配律、加法结合律简算;
②3060÷15-2.5×1.04,先算除法、乘法,再算减法;
③15.6÷4-5.6×
,把除数转化为乘它的倒数,再意义乘法分配律简算;
④
×(
-
÷
),先算括号里面的除法,再算括号里面的减法,最后算乘法;
⑤
×[
÷(
+
)],先算先括号里面的加法,再算中括号里面的除法,最后算乘法;
⑥
×27+16×
.转化为
×27+19×
,意义乘法分配律简算.
| 5 |
| 9 |
| 1 |
| 13 |
| 4 |
| 13 |
②3060÷15-2.5×1.04,先算除法、乘法,再算减法;
③15.6÷4-5.6×
| 1 |
| 4 |
④
| 7 |
| 15 |
| 5 |
| 7 |
| 3 |
| 14 |
| 3 |
| 4 |
⑤
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
⑥
| 16 |
| 23 |
| 19 |
| 23 |
| 16 |
| 23 |
| 16 |
| 23 |
解答:
解:①(
+
)×9+
=
×9+
×9+
=5+(
+
)
=5+1
=6;
②3060÷15-2.5×1.04
=204-2.6
=201.4;
③15.6÷4-5.6×
=(15.6-5.6)×
=10×
=2
;
④
×(
-
÷
)
=
×(
-
)
=
×
=
;
⑤
×[
÷(
+
)]
=
×[
÷
]
=
×[
×
]
=
×
=
;
⑥
×27+16×
=
×27+19×
=
×(27+19)
=
×46
=32.
| 5 |
| 9 |
| 1 |
| 13 |
| 4 |
| 13 |
=
| 5 |
| 9 |
| 1 |
| 13 |
| 4 |
| 13 |
=5+(
| 9 |
| 13 |
| 4 |
| 13 |
=5+1
=6;
②3060÷15-2.5×1.04
=204-2.6
=201.4;
③15.6÷4-5.6×
| 1 |
| 4 |
=(15.6-5.6)×
| 1 |
| 4 |
=10×
| 1 |
| 4 |
=2
| 1 |
| 2 |
④
| 7 |
| 15 |
| 5 |
| 7 |
| 3 |
| 14 |
| 3 |
| 4 |
=
| 7 |
| 15 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 7 |
| 15 |
| 3 |
| 7 |
=
| 1 |
| 5 |
⑤
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 4 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 20 |
⑥
| 16 |
| 23 |
| 19 |
| 23 |
=
| 16 |
| 23 |
| 16 |
| 23 |
=
| 16 |
| 23 |
=
| 16 |
| 23 |
=32.
点评:此题考查的目的是理解整数整数、小数、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.
练习册系列答案
相关题目