题目内容
(2011?高邮市模拟)脱式计算.
80.3-33.3×0.5÷0.37
(
-
)×12÷0.1
×[
÷(
+
)].
80.3-33.3×0.5÷0.37
(
3 |
4 |
2 |
3 |
3 |
8 |
8 |
9 |
5 |
6 |
3 |
4 |
分析:小数、分数的四则混合运算同整数的四则混合运算类似,先算乘除,后算加减,有括号的先算括号内的.
解答:解:80.3-33.3×0.5÷0.37,
=80.3-16.65÷0.37,
=80.3-45,
=35.3;
(
-
)×12÷0.1,
=(
×12-
× 12)÷0.1,
=(9-8)÷0.1,
=1÷0.1,
=10;
×[
÷(
+
)],
=
×【
÷(
+
)】,
=
×(
÷
),
=
×
×
,
=
.
=80.3-16.65÷0.37,
=80.3-45,
=35.3;
(
3 |
4 |
2 |
3 |
=(
3 |
4 |
2 |
3 |
=(9-8)÷0.1,
=1÷0.1,
=10;
3 |
8 |
8 |
9 |
5 |
6 |
3 |
4 |
=
3 |
8 |
8 |
9 |
10 |
12 |
9 |
12 |
=
3 |
8 |
8 |
9 |
19 |
12 |
=
3 |
8 |
8 |
9 |
12 |
19 |
=
4 |
19 |
点评:在分数加减运算中,分母不同,要先通分,再加减.灵活运用乘法交换律和去括号,可使运算简便.

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