题目内容
计算下面各题(能简算的要简算)
+
-
=
15
-5
×0+5
÷2
=
3.4×1
+2.6×1
=
(
-1÷1
)×(1-
)=
(1
×1
+3.25×1
)÷(5.75+2
+
)
| 1 |
| 6 |
| 3 |
| 4 |
| 7 |
| 8 |
15
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 12 |
| 1 |
| 6 |
3.4×1
| 5 |
| 6 |
| 5 |
| 6 |
(
| 14 |
| 15 |
| 1 |
| 4 |
| 7 |
| 16 |
(1
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)通分计算;
(2)注意0乘任何数都得0,先算除法,然后从左往右依次计算;
(3)运用乘法分配律简算;
(4)两个括号同时计算,第一个括号先算括号内的除法,再算括号内的减法.最后算括号外的乘法;
(5)把小数化为分数,第一个括号先算乘法,再算加法,第二个括号运用加法交换律与结合律简算.最后算括号外的除法.
(2)注意0乘任何数都得0,先算除法,然后从左往右依次计算;
(3)运用乘法分配律简算;
(4)两个括号同时计算,第一个括号先算括号内的除法,再算括号内的减法.最后算括号外的乘法;
(5)把小数化为分数,第一个括号先算乘法,再算加法,第二个括号运用加法交换律与结合律简算.最后算括号外的除法.
解答:
解:(1)
+
-
=
+
-
=
(2)15
-5
×0+5
÷2
=15
-0+
×
=
-
=13
(3)3.4×1
+2.6×1
=(3.4+2.6)×1
=6×
=11
(4)(
-1÷1
)×(1-
)
=(
-1×
)×
=(
-
)×
=
×
=
(5)(1
×1
+3.25×1
)÷(5.75+2
+
)
=(
×
+
×
)÷(5
+2
+
)
=
×(
+
)÷(5
+2
+
)
=
×5÷(5
+
+2
)
=
÷
=1
| 1 |
| 6 |
| 3 |
| 4 |
| 7 |
| 8 |
=
| 4 |
| 24 |
| 18 |
| 24 |
| 21 |
| 24 |
=
| 1 |
| 24 |
(2)15
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 12 |
| 1 |
| 6 |
=15
| 1 |
| 2 |
| 65 |
| 12 |
| 6 |
| 13 |
=
| 31 |
| 2 |
| 5 |
| 2 |
=13
(3)3.4×1
| 5 |
| 6 |
| 5 |
| 6 |
=(3.4+2.6)×1
| 5 |
| 6 |
=6×
| 11 |
| 6 |
=11
(4)(
| 14 |
| 15 |
| 1 |
| 4 |
| 7 |
| 16 |
=(
| 14 |
| 15 |
| 4 |
| 5 |
| 9 |
| 16 |
=(
| 14 |
| 15 |
| 4 |
| 5 |
| 9 |
| 16 |
=
| 2 |
| 15 |
| 9 |
| 16 |
=
| 3 |
| 40 |
(5)(1
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
=(
| 5 |
| 3 |
| 7 |
| 4 |
| 13 |
| 4 |
| 5 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 3 |
| 7 |
| 4 |
| 13 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 25 |
| 3 |
| 25 |
| 3 |
=1
点评:此题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.
练习册系列答案
相关题目