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(2009•承德县模拟)计算,能简算的要简算.(4-7.5×415)÷1190.25÷523+0.25×5252.8×27+1.2÷7245÷[72×(34−13)]7.2+[(7.8+15)÷0.4]65−27+45−57.
题目详情
(2009•承德县模拟)
计算,能简算的要简算. (4-7.5×
| 0.25÷
| 2.8×
| ||||||||||||||
45÷[72×(
| 7.2+[(7.8+
|
|
▼优质解答
答案和解析
(1)(4-7.5×
)÷
,
=(4-2)÷
,
=2×
,
=
;
(2)0.25÷
+0.25×5
,
=0.25×
+0.25×
,
=0.25×(
+
),
=0.25×10,
=2.5;
(3)2.8×
+1.2÷
,
=2.8×
+1.2×
,
=(2.8+1.2)×
,
=4×
,
=
;
(4)45÷[72×(
−
)],
=45÷[72×
],
=45÷30,
=1.5;
(5)7.2+[(7.8+
)÷0.4],
=7.2+[8÷0.4],
=7.2+20,
=27.2;
(6)
−
+
−
,
=(
+
)-(
+
),
=2-1,
=1.
4 |
15 |
11 |
9 |
=(4-2)÷
11 |
9 |
=2×
9 |
11 |
=
18 |
11 |
(2)0.25÷
5 |
23 |
2 |
5 |
=0.25×
23 |
5 |
27 |
5 |
=0.25×(
23 |
5 |
27 |
5 |
=0.25×10,
=2.5;
(3)2.8×
2 |
7 |
7 |
2 |
=2.8×
2 |
7 |
2 |
7 |
=(2.8+1.2)×
2 |
7 |
=4×
2 |
7 |
=
8 |
7 |
(4)45÷[72×(
3 |
4 |
1 |
3 |
=45÷[72×
5 |
12 |
=45÷30,
=1.5;
(5)7.2+[(7.8+
1 |
5 |
=7.2+[8÷0.4],
=7.2+20,
=27.2;
(6)
6 |
5 |
2 |
7 |
4 |
5 |
5 |
7 |
=(
6 |
5 |
4 |
5 |
2 |
7 |
5 |
7 |
=2-1,
=1.
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