题目内容
能简算的要简算
|
| (
| ||||||||||||||||
| 87×
| 1-
|
考点:整数、分数、小数、百分数四则混合运算,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:(1)按从左到右的顺序计算即可;
(2)(3)(5)利用乘法分配律简算;
(4)先算括号里面的减法,最后算括号外的除法和乘法;
(6)先算除法,再算减法.
(2)(3)(5)利用乘法分配律简算;
(4)先算括号里面的减法,最后算括号外的除法和乘法;
(6)先算除法,再算减法.
解答:
解:(1)
÷0.875×
=
×
=
(2)
×
+
×
=
×(
+
)
=
×1
=
(3)(
-
)×36
=
×36-
×36
=21-10
=11
(4)
÷(
-
)×
=
÷
×
=
×
×
=
(5)87×
=(88-1)×
=88×
-1×
=87-
=86
(6)1-
÷
=1-
=
| 2 |
| 5 |
| 7 |
| 10 |
=
| 16 |
| 35 |
| 7 |
| 10 |
=
| 8 |
| 25 |
(2)
| 5 |
| 18 |
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 4 |
=
| 5 |
| 18 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 5 |
| 18 |
=
| 5 |
| 18 |
(3)(
| 7 |
| 12 |
| 5 |
| 18 |
=
| 7 |
| 12 |
| 5 |
| 18 |
=21-10
=11
(4)
| 4 |
| 15 |
| 13 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 4 |
| 15 |
| 7 |
| 9 |
| 5 |
| 6 |
=
| 4 |
| 15 |
| 9 |
| 7 |
| 5 |
| 6 |
=
| 2 |
| 7 |
(5)87×
| 87 |
| 88 |
=(88-1)×
| 87 |
| 88 |
=88×
| 87 |
| 88 |
| 87 |
| 88 |
=87-
| 87 |
| 88 |
=86
| 1 |
| 88 |
(6)1-
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
点评:计算四则混合运算时,要按照运算顺序,先算乘除,后算加减,有括号的先算括号里面的,再算括号外面的.能简算的要简算.
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