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(2014•临川区模拟)脱式计算(能简便要简便运算)(259+259+259+259)×0.25[3.6-(1.6+29)-79]×3789×[34-(716-0.25)]7.05×37+64×7.05-7.05.

题目详情
(2014•临川区模拟)脱式计算(能简便要简便运算)
(2
5
9
+2
5
9
+2
5
9
+2
5
9
)×0.25
[3.6-(1.6+
2
9
)-
7
9
3
7

8
9
×[
3
4
-(
7
16
-0.25)]
7.05×37+64×7.05-7.05.
▼优质解答
答案和解析
(1)(2
5
9
+2
5
9
+2
5
9
+2
5
9
)×0.25
=2
5
9
×4×0.25
=2
5
9
×(4×0.25)
=2
5
9
×1
═2
5
9


(2)[3.6-(1.6+
2
9
)-
7
9
3
7

=[(3.6-1.6)-(
2
9
+
7
9
)]×
3
7

=[2-1]×
3
7

=1×
3
7

=
3
7


(3)
8
9
×[
3
4
-(
7
16
-0.25)]
=
8
9
×[
3
4
-
7
16
+0.25]
=
8
9
×[
3
4
+0.25-
7
16
]
=
8
9
×[1-
7
16
]
=
8
9
×
9
16

=