题目内容
下面各题能简算的要简算:
12.56-(
+9.6÷
)
10-
×
-0.75×
22×(
+
)×8
÷[
÷(
-0.5)].
12.56-(
| 3 |
| 50 |
| 16 |
| 5 |
10-
| 7 |
| 15 |
| 3 |
| 4 |
| 143 |
| 15 |
22×(
| 2 |
| 11 |
| 3 |
| 16 |
| 3 |
| 14 |
| 5 |
| 4 |
| 14 |
| 3 |
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)先算小括号里的除法,再算小括号里的加法,最后算括号外的减法;
(2)先运用乘法分配律进行简算,再算减法;
(3)运用乘法分配律进行简算;
(4)先算小括号里的减法,再算中括号里的除法,最后算括号外的除法.
(2)先运用乘法分配律进行简算,再算减法;
(3)运用乘法分配律进行简算;
(4)先算小括号里的减法,再算中括号里的除法,最后算括号外的除法.
解答:
解:(1)12.56-(
+9.6÷
)
=12.56-(
+3)
=12.56-3.06
=9.5;
(2)10-
×
-0.75×
=10-(
×
+0.75×
)
=10-[(
+
)×
]
=10-[10×
]
=10-7.5
=2.5;
(3)22×(
+
)×8
=22×
×8+22×
×8
=32+33
=65;
(4)
÷[
÷(
-0.5)]
=
÷[
÷
]
=
÷
=
.
| 3 |
| 50 |
| 16 |
| 5 |
=12.56-(
| 3 |
| 50 |
=12.56-3.06
=9.5;
(2)10-
| 7 |
| 15 |
| 3 |
| 4 |
| 143 |
| 15 |
=10-(
| 7 |
| 15 |
| 3 |
| 4 |
| 143 |
| 15 |
=10-[(
| 7 |
| 15 |
| 143 |
| 15 |
| 3 |
| 4 |
=10-[10×
| 3 |
| 4 |
=10-7.5
=2.5;
(3)22×(
| 2 |
| 11 |
| 3 |
| 16 |
=22×
| 2 |
| 11 |
| 3 |
| 16 |
=32+33
=65;
(4)
| 3 |
| 14 |
| 5 |
| 4 |
| 14 |
| 3 |
=
| 3 |
| 14 |
| 5 |
| 4 |
| 25 |
| 6 |
=
| 3 |
| 14 |
| 3 |
| 10 |
=
| 5 |
| 7 |
点评:此题主要考查四则混合运算,要求学生掌握运算顺序和计算法则,并且能够灵活选择简便方法进行简算.
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