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用递等式计算,能简算的要简算.3.72×3.5+6.28×3.575-38-5834-29+54+2913+(34-25)1517-(14-217)3.2×2.5×1.25.
题目详情
用递等式计算,能简算的要简算. 3.72×3.5+6.28×3.5 |
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| 3.2×2.5×1.25. |
▼优质解答
答案和解析
(1)3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35;
(2)
-
-
=
-(
+
)
=
-1
=
;
(3)
-
+
+
=(
+
)+(
-
)
=2+0
=2;
(4)
+(
-
)
=
+
=
;
(5)
-(
-
)
=
-
+
=
+
-
=(3.72+6.28)×3.5
=10×3.5
=35;
(2)
7 |
5 |
3 |
8 |
5 |
8 |
=
7 |
5 |
3 |
8 |
5 |
8 |
=
7 |
5 |
=
2 |
5 |
(3)
3 |
4 |
2 |
9 |
5 |
4 |
2 |
9 |
=(
3 |
4 |
5 |
4 |
2 |
9 |
2 |
9 |
=2+0
=2;
(4)
1 |
3 |
3 |
4 |
2 |
5 |
=
1 |
3 |
7 |
20 |
=
41 |
60 |
(5)
15 |
17 |
1 |
4 |
2 |
17 |
=
15 |
17 |
1 |
4 |
2 |
17 |
=
15 |
17 |
2 |
17 |
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