题目内容
脱式计算
①854-3232÷32
②
-
+
③1.5×(7.1-6.9)+6.73
④
÷[
×(
+
)].
①854-3232÷32
②
8 |
9 |
5 |
6 |
1 |
3 |
③1.5×(7.1-6.9)+6.73
④
5 |
8 |
12 |
17 |
1 |
2 |
9 |
16 |
分析:①先算除法,再算减法;
②按照从左到右的顺序计算;
③先算小括号里面的减法,再算括号外的乘法,最后算加法;
④先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
②按照从左到右的顺序计算;
③先算小括号里面的减法,再算括号外的乘法,最后算加法;
④先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
解答:解:①854-3232÷32,
=854-101,
=753;
②
-
+
,
=
+
,
=
;
③1.5×(7.1-6.9)+6.73,
=1.5×0.2+6.73,
=0.3+6.73,
=7.03;
④
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
=854-101,
=753;
②
8 |
9 |
5 |
6 |
1 |
3 |
=
1 |
18 |
1 |
3 |
=
7 |
18 |
③1.5×(7.1-6.9)+6.73,
=1.5×0.2+6.73,
=0.3+6.73,
=7.03;
④
5 |
8 |
12 |
17 |
1 |
2 |
9 |
16 |
=
5 |
8 |
12 |
17 |
17 |
16 |
=
5 |
8 |
6 |
8 |
=
5 |
6 |
点评:此题主要考查分数、整数、小数的四则混合运算,注意运算的顺序.
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