题目内容
计算:
1-
+
1.4×(1
-
)
×[
÷(
-
]
)÷
2÷
+(
+
)
1-
| 2 |
| 3 |
| 5 |
| 6 |
1.4×(1
| 5 |
| 7 |
| 11 |
| 14 |
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
)÷
| 13 |
| 16 |
| 3 |
| 4 |
| 5 |
| 8 |
| 13 |
| 16 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)从左往右依次计算;
(2)运用乘法分配律简算;
(3)先算小括号内的,在算中括号内的,最后算括号外的;
(4)先算除法,然后从左往右依次计算.
(2)运用乘法分配律简算;
(3)先算小括号内的,在算中括号内的,最后算括号外的;
(4)先算除法,然后从左往右依次计算.
解答:
解:(1)1-
+
=
+
=
(2)1.4×(1
-
)
=1.4×(
-
)
=1.4×
-
×1.4
=2.4-1.1
=1.3
(3)
×[
÷(
-
)]
=
×[
÷
]
=
×
=4
(4)12÷
+(
+
)
=16+
=17
| 2 |
| 3 |
| 5 |
| 6 |
=
| 1 |
| 3 |
| 5 |
| 6 |
=
| 7 |
| 6 |
(2)1.4×(1
| 5 |
| 7 |
| 11 |
| 14 |
=1.4×(
| 12 |
| 7 |
| 11 |
| 14 |
=1.4×
| 12 |
| 7 |
| 11 |
| 14 |
=2.4-1.1
=1.3
(3)
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 8 |
| 9 |
| 1 |
| 12 |
=
| 3 |
| 8 |
| 32 |
| 3 |
=4
(4)12÷
| 3 |
| 4 |
| 5 |
| 8 |
| 13 |
| 16 |
=16+
| 23 |
| 16 |
=17
| 7 |
| 16 |
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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