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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