题目内容
脱式计算
①12.2+3.2÷0.4-2.9
②
÷[
÷(
-
)].
①12.2+3.2÷0.4-2.9
②
3 |
18 |
9 |
22 |
5 |
11 |
1 |
3 |
考点:小数四则混合运算,分数的四则混合运算
专题:运算顺序及法则
分析:①先算除法,然后从左往右依次计算.
②先算小括号内的,再算中括号内的,最后算括号外的.
②先算小括号内的,再算中括号内的,最后算括号外的.
解答:
解:①12.2+3.2÷0.4-2.9
=12.2+8-2.9
=20.2-2.9
=17.3;
②
÷[
÷(
-
)]
=
÷[
÷
]
=
÷[
×
]
=
÷
=
×
=
.
=12.2+8-2.9
=20.2-2.9
=17.3;
②
3 |
18 |
9 |
22 |
5 |
11 |
1 |
3 |
=
3 |
18 |
9 |
22 |
4 |
33 |
=
1 |
6 |
9 |
22 |
33 |
4 |
=
1 |
6 |
27 |
8 |
=
1 |
6 |
8 |
27 |
=
4 |
81 |
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.
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