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用简便方法计算.5/8÷2/3+3/8×2/3(3/4-5/7)×28{2-(3/4+1/3)}÷2/3.
题目详情
用简便方法计算. 5/8÷2/3+3/8×2/3 | (3/4-5/7)×28 | {2-(3/4+1/3)}÷2/3. |
▼优质解答
答案和解析
(1)
÷
+
×
,
=
+
,
=1.5;
(2)(
−
)×28,
=
×28-
×28,
=21-20,
=1;
(3)[2-(
+
)]÷
,
=[2-
]÷
,
=
÷
,
=1
.
5 |
8 |
2 |
3 |
3 |
8 |
2 |
3 |
=
15 |
16 |
9 |
16 |
=1.5;
(2)(
3 |
4 |
5 |
7 |
=
3 |
4 |
5 |
7 |
=21-20,
=1;
(3)[2-(
3 |
4 |
1 |
3 |
2 |
3 |
=[2-
13 |
12 |
2 |
3 |
=
11 |
12 |
2 |
3 |
=1
3 |
8 |
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