题目内容
(2005?江阴市)用递增式计算下列各题.
①914-316÷79×208
②2.37+1.75+1.63+1.25
③
×
+
×
④
+(
+
)×
.
①914-316÷79×208
②2.37+1.75+1.63+1.25
③
9 |
20 |
11 |
25 |
14 |
25 |
9 |
20 |
④
2 |
3 |
1 |
2 |
2 |
3 |
2 |
7 |
分析:①④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;
②可根据加法交换律及结合律计算;
③根据乘法分配律计算即可.
②可根据加法交换律及结合律计算;
③根据乘法分配律计算即可.
解答:解:①914-316÷79×208
=914-4×208,
=914-832,
=82;
②2.37+1.75+1.63+1.25
=(2.37+1.63)+(1.75+1.25),
=4+3,
=7;
③
×
+
×
=(
+
)×
,
=1×
,
=
;
④
+(
+
)×
=
+
×
,
=
+
,
=1.
=914-4×208,
=914-832,
=82;
②2.37+1.75+1.63+1.25
=(2.37+1.63)+(1.75+1.25),
=4+3,
=7;
③
9 |
20 |
11 |
25 |
14 |
25 |
9 |
20 |
=(
11 |
25 |
14 |
25 |
9 |
20 |
=1×
9 |
20 |
=
9 |
20 |
④
2 |
3 |
1 |
2 |
2 |
3 |
2 |
7 |
=
2 |
3 |
7 |
6 |
2 |
7 |
=
2 |
3 |
1 |
3 |
=1.
点评:完成脱式计算时要注意计算过程的完整性,中间不要有太大跳跃.
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