题目内容
(2011?田东县)计算下列各题.
860-560÷8×7 | (5.9+1.65)÷2.5 | (
|
|
分析:本题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.
(
+
)×20÷
可根据乘法分配律计算.
(
3 |
4 |
4 |
5 |
31 |
21 |
解答:解:860-560÷8×7
=860-70×7,
=860-490,
=370;
(5.9+1.65)÷2.5
=7.55÷2.5,
=3.02;
(
+
)×20÷
=(
×20+
×20)÷
,
=(15+16)×
,
=31×
,
=21;
÷[(
+
)×
].
=
÷[
×
],
=
÷
,
=
.
=860-70×7,
=860-490,
=370;
(5.9+1.65)÷2.5
=7.55÷2.5,
=3.02;
(
3 |
4 |
4 |
5 |
31 |
21 |
=(
3 |
4 |
4 |
5 |
31 |
21 |
=(15+16)×
21 |
31 |
=31×
21 |
31 |
=21;
3 |
5 |
7 |
9 |
1 |
3 |
3 |
2 |
=
3 |
5 |
10 |
9 |
3 |
2 |
=
3 |
5 |
5 |
3 |
=
9 |
25 |
点评:当算式中同时含有中括号与小括号时,要先计算中括号里面的,再计算小括号里面的.
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