题目内容
计算下面各题.(能简算的要简算) ①36×(
|
②56×0.18+18%×44 | ③4-4×(
| ||||||||||||||
④14÷
|
⑤3÷
|
⑥(
|
分析:算式①②可根据乘法分配律计算;
算式③④⑤⑥根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
算式③④⑤⑥根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
解答:解:①36×(
-
)
=36×
-36×
,
=20-15,
=5;
②56×0.18+18%×44
=56×0.18+0.18×44,
=(56+44)×0.18,
=100×0.18,
=18;
③4-4×(
+
)
=4-4×
,
=4-3
,
=
;
④14÷
×
=14×
×
,
=7
;
⑤3÷
-
÷3
=3×
-
×
,
=4-
,
=3
;
⑥(
+
)÷
=
×
,
=
.
5 |
9 |
5 |
12 |
=36×
5 |
9 |
5 |
12 |
=20-15,
=5;
②56×0.18+18%×44
=56×0.18+0.18×44,
=(56+44)×0.18,
=100×0.18,
=18;
③4-4×(
5 |
12 |
3 |
8 |
=4-4×
19 |
24 |
=4-3
1 |
6 |
=
5 |
6 |
④14÷
7 |
5 |
5 |
7 |
=14×
5 |
7 |
5 |
7 |
=7
1 |
7 |
⑤3÷
3 |
4 |
3 |
4 |
=3×
4 |
3 |
3 |
4 |
1 |
3 |
=4-
1 |
4 |
=3
3 |
4 |
⑥(
1 |
4 |
2 |
5 |
13 |
15 |
=
13 |
20 |
15 |
13 |
=
3 |
4 |
点评:完成有关于分数的四则混合运算时要细心,注意通分约分.
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