题目内容
计算下面各题,能简算的要简算.
24×(
+
-
)
×
×(56+8)
×
+
÷
(1÷
+
÷1)×
.
24×(
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 7 |
| 5 |
| 8 |
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 10 |
| 11 |
(1÷
| 1 |
| 6 |
| 1 |
| 6 |
| 2 |
| 3 |
分析:(1)(2)根据乘法分配律简便计算;
(3)将除法变为乘法,再根据乘法分配律简便计算;
(4)先算小括号里面的除法,再根据乘法分配律简便计算.
(3)将除法变为乘法,再根据乘法分配律简便计算;
(4)先算小括号里面的除法,再根据乘法分配律简便计算.
解答:解:(1)24×(
+
-
)
=24×
+24×
-24×
=3+4-2
=5;
(2)
×
×(56+8)
=
×
×56+
×
×8
=5+
=5
;
(3)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(4)(1÷
+
÷1)×
=(6+
)×
=6×
+
×
=4+
=4
.
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 12 |
=24×
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 12 |
=3+4-2
=5;
(2)
| 1 |
| 7 |
| 5 |
| 8 |
=
| 1 |
| 7 |
| 5 |
| 8 |
| 1 |
| 7 |
| 5 |
| 8 |
=5+
| 5 |
| 7 |
=5
| 5 |
| 7 |
(3)
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 10 |
| 11 |
=
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 11 |
| 10 |
=(
| 5 |
| 8 |
| 3 |
| 8 |
| 11 |
| 10 |
=1×
| 11 |
| 10 |
=
| 11 |
| 10 |
(4)(1÷
| 1 |
| 6 |
| 1 |
| 6 |
| 2 |
| 3 |
=(6+
| 1 |
| 6 |
| 2 |
| 3 |
=6×
| 2 |
| 3 |
| 1 |
| 6 |
| 2 |
| 3 |
=4+
| 1 |
| 9 |
=4
| 1 |
| 9 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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