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计算(能简算的要用简便方法计算.)(1)18715-(10715+6.47)(2)515×45+45×3.6+45×120%(3)313-(157+18÷134)×125(4)3.8-245÷[(3.2-145)×56](5)19.99+1.999×990(6)0.378×76000-378×66+8
题目详情
计算(能简算的要用简便方法计算.)
(1)18
-(10
+6.47)
(2)5
×45+45×3.6+45×120%
(3)3
-(1
+
÷1
)×1
(4)3.8-2
÷[(3.2-1
)×
]
(5)19.99+1.999×990
(6)0.378×76000-378×66+84×378+37.8×60
(7)(1
+2
+3
+1
)×(1-
)
(8)0.24÷[(8.8-6
)÷1
]+
.
(1)18
7 |
15 |
7 |
15 |
(2)5
1 |
5 |
(3)3
1 |
3 |
5 |
7 |
1 |
8 |
3 |
4 |
2 |
5 |
(4)3.8-2
4 |
5 |
4 |
5 |
5 |
6 |
(5)19.99+1.999×990
(6)0.378×76000-378×66+84×378+37.8×60
(7)(1
3 |
4 |
2 |
3 |
1 |
4 |
1 |
3 |
7 |
8 |
(8)0.24÷[(8.8-6
2 |
3 |
2 |
3 |
17 |
20 |
▼优质解答
答案和解析
(1)18
-(10
+6.47),
=18
-10
-6.47,
=8-6.47,
=1.53;
(2)5
×45+45×3.6+45×120%,
=(5
+3.6+120%)×45,
=(5.2+3.6+1.2)×45,
=10×45,
=450;
(3)3
-(1
+
÷1
)×1
,
=3
-(1
+
×
)×1
,
=3
-(1
+
)×1
,
=3
-
×
,
=3
-
,
=
;
(4)3.8-2
÷[(3.2-1
)×
],
=3.8-2
7 |
15 |
7 |
15 |
=18
7 |
15 |
7 |
15 |
=8-6.47,
=1.53;
(2)5
1 |
5 |
=(5
1 |
5 |
=(5.2+3.6+1.2)×45,
=10×45,
=450;
(3)3
1 |
3 |
5 |
7 |
1 |
8 |
3 |
4 |
2 |
5 |
=3
1 |
3 |
5 |
7 |
1 |
8 |
4 |
7 |
2 |
5 |
=3
1 |
3 |
5 |
7 |
1 |
14 |
2 |
5 |
=3
1 |
3 |
25 |
14 |
7 |
5 |
=3
1 |
3 |
5 |
2 |
=
5 |
6 |
(4)3.8-2
4 |
5 |
4 |
5 |
5 |
6 |
=3.8-2
4 |
5
作业帮用户
2016-12-10
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