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脱式计算(能简算的要用简便方法计算).(1)119×(257×2138-515÷413)(2)99.9*98+(0.8-35)*999(3)27*1.6÷(10-78÷316)(4)(1234+4567*7890)/(4568*7890-6656)
题目详情
脱式计算(能简算的要用简便方法计算).
(1)1
×(2
×
-5
÷4
)
(2)99.9*98+(0.8-
)*999
(3)
*1.6÷(10-
÷
)
(4)(1234+4567*7890)/(4568*7890-6656)
(1)1
1 |
9 |
5 |
7 |
21 |
38 |
1 |
5 |
1 |
3 |
(2)99.9*98+(0.8-
3 |
5 |
(3)
2 |
7 |
7 |
8 |
3 |
16 |
(4)(1234+4567*7890)/(4568*7890-6656)
▼优质解答
答案和解析
(1)1
×(2
×
-5
÷4
),
=
×(
×
−
×
),
=
×(
−
),
=
×(
−
),
=
×
,
=
;
(2)99.9×98+(0.8-
)×999,
=999×9.8+0.2×999,
=999×(9.8+0.2),
=999×10,
=9990;
(3)
×1.6÷(10-
÷
),
=
×1.6÷(10-
×
),
=
×1.6÷(
-
),
=
×1.6÷
1 |
9 |
5 |
7 |
21 |
38 |
1 |
5 |
1 |
3 |
=
10 |
9 |
19 |
7 |
21 |
38 |
26 |
5 |
3 |
13 |
=
10 |
9 |
3 |
2 |
6 |
5 |
=
10 |
9 |
15 |
10 |
12 |
10 |
=
10 |
9 |
3 |
10 |
=
1 |
3 |
(2)99.9×98+(0.8-
3 |
5 |
=999×9.8+0.2×999,
=999×(9.8+0.2),
=999×10,
=9990;
(3)
2 |
7 |
7 |
8 |
3 |
16 |
=
2 |
7 |
7 |
8 |
16 |
3 |
=
2 |
7 |
30 |
3 |
14 |
3 |
=
2 |
7 |
作业帮用户
2017-10-11
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