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怎样算简便就怎样算.2.5×(0.87×4)65×63641-(14+13)÷7879÷115+29×51125÷(34+25)0.9+9×910
题目详情
怎样算简便就怎样算. 2.5×(0.87×4) | 65×
| 1-(
| ||||||||||||||||
|
| 0.9+9×
|
▼优质解答
答案和解析
(1)2.5×(0.87×4)
=2.5×4×0.87
=8.7;
(2)65×
=(64+1)×
=64×
+
=63
;
(3)1-(
+
)÷
=1-
=
;
(4)
÷
+
×
=
×
+
×
=(
+
)×
=
;
(5)
÷(
+
)
=
÷
=
×
=
;
(6)0.9+9×
=2.5×4×0.87
=8.7;
(2)65×
63 |
64 |
=(64+1)×
63 |
64 |
=64×
63 |
64 |
63 |
64 |
=63
63 |
64 |
(3)1-(
1 |
4 |
1 |
3 |
7 |
8 |
=1-
2 |
3 |
=
1 |
3 |
(4)
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
=
7 |
9 |
5 |
11 |
2 |
9 |
5 |
11 |
=(
2 |
9 |
7 |
9 |
5 |
11 |
=
5 |
11 |
(5)
2 |
5 |
3 |
4 |
2 |
5 |
=
2 |
5 |
23 |
20 |
=
2 |
5 |
20 |
23 |
=
8 |
23 |
(6)0.9+9×
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