题目内容
计算下面各题,能简算的要简算.
4.2×4.35+4.2×5.65
+
+
+
(
+
+
)×16
×〔(
-
)÷
〕
4.2×4.35+4.2×5.65
5 |
7 |
5 |
6 |
2 |
7 |
1 |
6 |
(
3 |
4 |
5 |
8 |
1 |
2 |
3 |
14 |
5 |
9 |
1 |
3 |
1 |
3 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)(3)(4)根据乘法的分配律简算;
(2)根据加法的交换律与结合律简算.
(2)根据加法的交换律与结合律简算.
解答:
解:(1)4.2×4.35+4.2×5.65
=4.2×(4.35+5.65)
=4.2×10
=42
(2)
+
+
+
=(
+
)+(
+
)
=1+1
=2
(3)(
+
+
)×16
=
×16+
×16+
×16
=12+10+8
=30
(4)
×〔(
-
)÷
〕
=
×〔(
-
)×3〕
=
×〔
×3-
×3〕
=
×
=
=4.2×(4.35+5.65)
=4.2×10
=42
(2)
5 |
7 |
5 |
6 |
2 |
7 |
1 |
6 |
=(
5 |
7 |
2 |
7 |
1 |
6 |
5 |
6 |
=1+1
=2
(3)(
3 |
4 |
5 |
8 |
1 |
2 |
=
3 |
4 |
5 |
8 |
1 |
2 |
=12+10+8
=30
(4)
3 |
14 |
5 |
9 |
1 |
3 |
1 |
3 |
=
3 |
14 |
5 |
9 |
1 |
3 |
=
3 |
14 |
5 |
9 |
1 |
3 |
=
3 |
14 |
2 |
3 |
=
1 |
7 |
点评:考查了运算定律与简便运算,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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