题目内容
计算下面各题,能简算的要简算.
×7+4×
-
(
+
)÷
×
45×
+15×
4
×
+3
÷8
(2+
)×
12-[
-(35%-
)×
]
32×
(
+
)-(
-
)-(
-
)-(
-
)-(
-
)
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
(
| 5 |
| 8 |
| 1 |
| 8 |
| 3 |
| 7 |
| 5 |
| 14 |
45×
| 3 |
| 4 |
| 3 |
| 4 |
4
| 5 |
| 6 |
| 1 |
| 8 |
| 1 |
| 6 |
(2+
| 7 |
| 5 |
| 5 |
| 14 |
12-[
| 1 |
| 5 |
| 1 |
| 10 |
| 1 |
| 5 |
32×
| 13 |
| 33 |
(
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 10 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:①根据乘法分配律计算;
②根据四则混合运算的运算顺序计算,除以一个数等于乘这个数的倒数;
③根据乘法分配律计算;
④除以一个数等于乘这个数的倒数;
⑤根据乘法分配律计算;
⑥根据四则混合运算的运算顺序计算;
⑦把32写成33-1,再根据乘法分配律计算;
⑧根据减法性质进行计算.
②根据四则混合运算的运算顺序计算,除以一个数等于乘这个数的倒数;
③根据乘法分配律计算;
④除以一个数等于乘这个数的倒数;
⑤根据乘法分配律计算;
⑥根据四则混合运算的运算顺序计算;
⑦把32写成33-1,再根据乘法分配律计算;
⑧根据减法性质进行计算.
解答:
解:①
×7+4×
-
=
×(7+4-1)
=
×10
=3
②(
+
)÷
×
=
×
×
=
③45×
+15×
=
×(45+15)
=
×60
=45
④4
×
+3
÷8
=4
×
+3
×
=
×(4
+3
)
=
×8
=1
⑤(2+
)×
=2×
+
×
=
+
=
+
=1
⑥12-[
-(35%-
)×
]
=12-[
-(
-
)×
]
=12-[
-
×
]
=12-
=11
⑦32×
=(33-1)×
=33×
-
=13-
=12
⑧(
+
)-(
-
)-(
-
)-(
-
)-(
-
)
=
+
-
+
-
+
-
+
-
+
=
+
=
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
=
| 3 |
| 10 |
=
| 3 |
| 10 |
=3
②(
| 5 |
| 8 |
| 1 |
| 8 |
| 3 |
| 7 |
| 5 |
| 14 |
=
| 6 |
| 8 |
| 7 |
| 3 |
| 5 |
| 14 |
=
| 5 |
| 8 |
③45×
| 3 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=45
④4
| 5 |
| 6 |
| 1 |
| 8 |
| 13 |
| 33 |
| 1 |
| 6 |
=4
| 5 |
| 6 |
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 8 |
=
| 1 |
| 8 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 8 |
=1
⑤(2+
| 7 |
| 5 |
| 5 |
| 14 |
=2×
| 5 |
| 14 |
| 7 |
| 5 |
| 5 |
| 14 |
=
| 5 |
| 7 |
| 1 |
| 2 |
=
| 10 |
| 14 |
| 7 |
| 14 |
=1
| 3 |
| 14 |
⑥12-[
| 1 |
| 5 |
| 1 |
| 10 |
| 1 |
| 5 |
=12-[
| 1 |
| 5 |
| 7 |
| 20 |
| 2 |
| 20 |
| 1 |
| 5 |
=12-[
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
=12-
| 3 |
| 20 |
=11
| 17 |
| 20 |
⑦32×
| 13 |
| 33 |
=(33-1)×
| 13 |
| 33 |
=33×
| 13 |
| 33 |
| 13 |
| 33 |
=13-
| 13 |
| 33 |
=12
| 20 |
| 33 |
⑧(
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 10 |
=
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 10 |
=
| 1 |
| 5 |
| 1 |
| 10 |
=
| 3 |
| 10 |
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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