早教吧作业答案频道 -->其他-->
(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.
看了(2009•承德县模拟)计算,...的网友还看了以下:
15.6克苯溶于400g环己烷,该溶液的凝固点比纯溶剂低10.1℃.计算环己烷的凝固点降低常数.我 2020-05-16 …
混合运算(20.2×0.4+7.88)÷4.296.5×12.4-96.5×81375+450÷1 2020-06-27 …
口算72.5+37.5=8.09-4.16=1.25×8=4÷80=33.7-2.69=5.82+ 2020-07-09 …
直接写出得数.0.4+4.3=4.8÷6=5.8×100=940÷100=0.24÷4=50×0. 2020-07-09 …
4.3+5.8=3.6+6.4=0.74-0.34=0.9-0.25=5×4=0.21×3=0.6 2020-07-13 …
6分之5÷0.4×15分之43÷2分之1+3分之1(6分之5-5分之4)÷15分之247分之2+2 2020-07-19 …
一、口算:0.1×208=7.2÷36=4.8÷16=1.3×50=0.5×20=0.81÷0.0 2020-07-19 …
直接写出得数42×(16+17)=13.39÷13=(18+14)×4=34÷14=7.2÷0.4 2020-07-19 …
根据下面各数列前几项的值,写出数列的一个通项公式:(1)2/3,4/15,6/35,8/63,10 2020-07-24 …
直接写得数.0.7+0.8=10-0.98=0.5×2=28÷0.25÷0.4=15.7+3.4=. 2020-11-19 …