题目内容
脱式计算.(能简算的要简算)
(1)
+
×
÷6
(2)24×(
+
)
(3)3-1÷(
+
×
)
(4)1.75×
+
×
+
(5)(
-
)÷(
+
)
(6)
+
+
+
+
+
.
(1)
| 3 |
| 8 |
| 3 |
| 4 |
| 2 |
| 3 |
(2)24×(
| 3 |
| 8 |
| 3 |
| 4 |
(3)3-1÷(
| 5 |
| 7 |
| 6 |
| 7 |
| 1 |
| 3 |
(4)1.75×
| 6 |
| 7 |
| 3 |
| 14 |
| 7 |
| 4 |
| 7 |
| 4 |
(5)(
| 5 |
| 8 |
| 1 |
| 4 |
| 8 |
| 9 |
| 1 |
| 3 |
(6)
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
| 1 |
| 90 |
| 1 |
| 110 |
| 1 |
| 132 |
分析:(1)先算乘法,再算除法,最后算加法;
(2)运用乘法分配律简算;
(3)先算小括号里面的乘法,再算小括号里面的加法,然后算括号外的除法,最后算括号外的减法;
(4)运用乘法分配律简算;
(5)同时运算两个小括号里面的减法和加法,最后算括号外的除法;
(6)
=
-
,
=
-
…;由此化简求解.
(2)运用乘法分配律简算;
(3)先算小括号里面的乘法,再算小括号里面的加法,然后算括号外的除法,最后算括号外的减法;
(4)运用乘法分配律简算;
(5)同时运算两个小括号里面的减法和加法,最后算括号外的除法;
(6)
| 1 |
| 42 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 56 |
| 1 |
| 7 |
| 1 |
| 8 |
解答:解:(1)
+
×
÷6,
=
+
÷6,
=
+
,
=
;
(2)24×(
+
),
=24×
+24×
,
=9+18,
=27;
(3)3-1÷(
+
×
),
=3-1÷(
+
),
=3-1÷1,
=3-1,
=2;
(4)1.75×
+
×
+
,
=
×
+
×
+
,
=
×(
+
+1),
=
×
,
=
;
(5)(
-
)÷(
+
),
=
÷
,
=
;
(6)
+
+
+
+
+
,
=(
-
)+(
-
)+(
-
)+(
-
)+(
-
)+(
-
),
=
-
+
-
+
-
+
-
+
-
+
-
,
=
-
,
=
.
| 3 |
| 8 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 8 |
| 1 |
| 2 |
=
| 3 |
| 8 |
| 1 |
| 12 |
=
| 11 |
| 24 |
(2)24×(
| 3 |
| 8 |
| 3 |
| 4 |
=24×
| 3 |
| 8 |
| 3 |
| 4 |
=9+18,
=27;
(3)3-1÷(
| 5 |
| 7 |
| 6 |
| 7 |
| 1 |
| 3 |
=3-1÷(
| 5 |
| 7 |
| 2 |
| 7 |
=3-1÷1,
=3-1,
=2;
(4)1.75×
| 6 |
| 7 |
| 3 |
| 14 |
| 7 |
| 4 |
| 7 |
| 4 |
=
| 7 |
| 4 |
| 6 |
| 7 |
| 3 |
| 14 |
| 7 |
| 4 |
| 7 |
| 4 |
=
| 7 |
| 4 |
| 6 |
| 7 |
| 3 |
| 14 |
=
| 7 |
| 4 |
| 29 |
| 14 |
=
| 29 |
| 8 |
(5)(
| 5 |
| 8 |
| 1 |
| 4 |
| 8 |
| 9 |
| 1 |
| 3 |
=
| 3 |
| 8 |
| 11 |
| 9 |
=
| 27 |
| 88 |
(6)
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
| 1 |
| 90 |
| 1 |
| 110 |
| 1 |
| 132 |
=(
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 11 |
| 1 |
| 11 |
| 1 |
| 12 |
=
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 11 |
| 1 |
| 11 |
| 1 |
| 12 |
=
| 1 |
| 6 |
| 1 |
| 12 |
=
| 1 |
| 12 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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