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(2010•无锡)用递等式计算.①24×5+515÷5②1415×(514+521)+23③(12.5×8-40)÷0.6④78÷25÷0.4⑤910÷[12×(65-110)]⑥34+2917+14+3817.
题目详情
(2010•无锡)用递等式计算.
①24×5+515÷5
②
×(
+
)+
③(12.5×8-40)÷0.6
④78÷25÷0.4
⑤
÷[
×(
-
)]
⑥
+2
+
+3
.
①24×5+515÷5
②
14 |
15 |
5 |
14 |
5 |
21 |
2 |
3 |
③(12.5×8-40)÷0.6
④78÷25÷0.4
⑤
9 |
10 |
1 |
2 |
6 |
5 |
1 |
10 |
⑥
3 |
4 |
9 |
17 |
1 |
4 |
8 |
17 |
▼优质解答
答案和解析
①24×5+515÷5
=120+103,
=223;
②
×(
+
)+
=
×
+
×
+
,
=
+
+
,
=1
;
③(12.5×8-40)÷0.6
=(100-40)÷0.6,
=60÷0.6,
=100;
④78÷25÷0.4
=78÷(25×0.4),
=78÷10,
=7.8;
⑤
÷[
×(
-
)]
=
÷[
×
],
=
×
,
=
;
⑥
+2
+
+3
=(
+
)+(2
+3
),
=1+6,
=7.
=120+103,
=223;
②
14 |
15 |
5 |
14 |
5 |
21 |
2 |
3 |
=
14 |
15 |
5 |
14 |
14 |
15 |
5 |
21 |
2 |
3 |
=
1 |
3 |
2 |
9 |
2 |
3 |
=1
2 |
9 |
③(12.5×8-40)÷0.6
=(100-40)÷0.6,
=60÷0.6,
=100;
④78÷25÷0.4
=78÷(25×0.4),
=78÷10,
=7.8;
⑤
9 |
10 |
1 |
2 |
6 |
5 |
1 |
10 |
=
9 |
10 |
1 |
2 |
11 |
10 |
=
9 |
10 |
20 |
11 |
=
18 |
11 |
⑥
3 |
4 |
9 |
17 |
1 |
4 |
8 |
17 |
=(
3 |
4 |
1 |
4 |
9 |
17 |
8 |
17 |
=1+6,
=7.
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