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下面各题怎样简便就怎样算.87×386517÷9+19×1217215÷[1-(15+13)]5.37-1.47-2.53157+1112+67+112×130.25×(4.8-7.5÷3)
题目详情
下面各题怎样简便就怎样算.
87×
|
|
| ||||||||||||||
5.37-1.47-2.53 |
| 0.25×(4.8-7.5÷3) |
▼优质解答
答案和解析
(1)87×
=86×
+1×
=3+
=3
;
(2)
÷9+
×
=(
+
)×
=1×
=
;
(3)
÷[1-(
+
)]
=
÷[1-
]
=
÷
=
;
(4)5.37-1.47-2.53
=5.37-(1.47+2.53)
=5.37-4
=1.37;
(5)
+
+
+
×13
=(
+
)+(
+
×13)
=3+2
=5;
(6)0.25×(4.8-7.5÷3)
=0.25×(4.8-2.5)
=0.25×2.3
=0.575.
3 |
86 |
=86×
3 |
86 |
3 |
86 |
=3+
3 |
86 |
=3
3 |
86 |
(2)
5 |
17 |
1 |
9 |
12 |
17 |
=(
5 |
17 |
12 |
17 |
1 |
9 |
=1×
1 |
9 |
=
1 |
9 |
(3)
2 |
15 |
1 |
5 |
1 |
3 |
=
2 |
15 |
8 |
15 |
=
2 |
15 |
7 |
15 |
=
2 |
7 |
(4)5.37-1.47-2.53
=5.37-(1.47+2.53)
=5.37-4
=1.37;
(5)
15 |
7 |
11 |
12 |
6 |
7 |
1 |
12 |
=(
15 |
7 |
6 |
7 |
11 |
12 |
1 |
12 |
=3+2
=5;
(6)0.25×(4.8-7.5÷3)
=0.25×(4.8-2.5)
=0.25×2.3
=0.575.
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