题目内容
84×(
|
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|
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|
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|
6÷
|
分析:(1)运用乘法分配律简算;
(2)先算小括号里面的减法,再算括号外的除法;
(3)先算小括号里面的加法,再算括号外的乘法,最后算除法;
(4)先算乘法,再从左到右计算加法;
(5)先算乘法,再算加法;
(6)(7)先把除法变成乘法,再运用乘法分配律简算;
(8)先同时计算乘法和除法,再算加法.
(2)先算小括号里面的减法,再算括号外的除法;
(3)先算小括号里面的加法,再算括号外的乘法,最后算除法;
(4)先算乘法,再从左到右计算加法;
(5)先算乘法,再算加法;
(6)(7)先把除法变成乘法,再运用乘法分配律简算;
(8)先同时计算乘法和除法,再算加法.
解答:解:(1)84×(
-
)
=84×
-84×
=35-24
=11;
(2)
÷(2-
)
=
÷1
=
;
(3)
×(
+
)÷
=
×
×
=
×
=
;
(4)
+
×
+
=
+
+
=
+
=
;
(5)
×
+
=
+
=
;
(6)
×
+
÷9
=
×
+
×
=
×(
+
)
=
×1
=
;
(7)
÷7+
×
=
×
+
×
=
×(
+
)
=
×1
=
;
(8)6÷
+
×
=7+
=7
.
| 5 |
| 12 |
| 2 |
| 7 |
=84×
| 5 |
| 12 |
| 2 |
| 7 |
=35-24
=11;
(2)
| 5 |
| 6 |
| 1 |
| 3 |
=
| 5 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 2 |
(3)
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 4 |
| 9 |
=
| 1 |
| 5 |
| 5 |
| 6 |
| 9 |
| 4 |
=
| 1 |
| 6 |
| 9 |
| 4 |
=
| 3 |
| 8 |
(4)
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 1 |
| 2 |
| 3 |
| 10 |
| 2 |
| 5 |
=
| 8 |
| 10 |
| 2 |
| 5 |
=
| 6 |
| 5 |
(5)
| 3 |
| 5 |
| 2 |
| 3 |
| 4 |
| 5 |
=
| 2 |
| 5 |
| 4 |
| 5 |
=
| 6 |
| 5 |
(6)
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 9 |
=
| 3 |
| 4 |
| 8 |
| 9 |
| 1 |
| 9 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
(7)
| 13 |
| 10 |
| 13 |
| 10 |
| 6 |
| 7 |
=
| 13 |
| 10 |
| 1 |
| 7 |
| 13 |
| 10 |
| 6 |
| 7 |
=
| 13 |
| 10 |
| 1 |
| 7 |
| 6 |
| 7 |
=
| 13 |
| 10 |
=
| 13 |
| 10 |
(8)6÷
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 6 |
=7+
| 1 |
| 7 |
=7
| 1 |
| 7 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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