题目内容
下面各题能简便的要用简便方法计算. ①(
| ②
| ③(
| ||||||||||||||||
④5-
| ⑤5.3+
| ⑥[1-(
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:①根据乘法分配律进行简算;
②先算除法,再算加法;
③先算小括号里面的除法,再算减法,最后算括号外面的除法;
④先算除法,再根据减法的性质进行简算;
⑤根据加法交换律和结合律进行简算;
⑥先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
②先算除法,再算加法;
③先算小括号里面的除法,再算减法,最后算括号外面的除法;
④先算除法,再根据减法的性质进行简算;
⑤根据加法交换律和结合律进行简算;
⑥先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
解答:
解:①(
+
)×24
=
×24+
×24
=18+20
=38;
②
+
÷4
=
+
=
;
③(
÷3-
)÷
=(
-
)÷
=
÷
=
;
④5-
÷
-
=5-
-
=5-(
+
)
=5-1
=4;
⑤5.3+
+4.7+
=(5.3+4.7)+(
+
)
=10+1
=11;
⑥[1-(
-
)]×
=[1-
]×
=
×
=
.
3 |
4 |
5 |
6 |
=
3 |
4 |
5 |
6 |
=18+20
=38;
②
1 |
5 |
4 |
5 |
=
1 |
5 |
1 |
5 |
=
2 |
5 |
③(
3 |
5 |
1 |
7 |
1 |
4 |
=(
1 |
5 |
1 |
7 |
1 |
4 |
=
2 |
35 |
1 |
4 |
=
8 |
35 |
④5-
5 |
6 |
5 |
2 |
2 |
3 |
=5-
1 |
3 |
2 |
3 |
=5-(
1 |
3 |
2 |
3 |
=5-1
=4;
⑤5.3+
5 |
8 |
3 |
8 |
=(5.3+4.7)+(
5 |
8 |
3 |
8 |
=10+1
=11;
⑥[1-(
3 |
4 |
2 |
5 |
2 |
13 |
=[1-
7 |
20 |
2 |
13 |
=
13 |
20 |
2 |
13 |
=
1 |
10 |
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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