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(2013•鹤山市)用简便方法计算(写出简算过程).(1)2513-137-363(2)27×58+38×27(3)12.5×2.5×32.
题目详情
(2013•鹤山市)用简便方法计算(写出简算过程).
(1)2513-137-363
(2)
×
+
×
(3)12.5×2.5×32.
(1)2513-137-363
(2)
2 |
7 |
5 |
8 |
3 |
8 |
2 |
7 |
(3)12.5×2.5×32.
▼优质解答
答案和解析
2513-137-363
=2513-(137+363)
=2513-500
=2013
×
+
×
=
×(
+
)
=
×1
=
12.5×2.5×32
=12.5×2.5×4×8
=(12.5×8)×(2.5×4)
=100×10
=1000
2513-137-363
=2513-(137+363)
=2513-500
=2013
2 |
7 |
5 |
8 |
3 |
8 |
2 |
7 |
=
2 |
7 |
5 |
8 |
3 |
8 |
=
2 |
7 |
=
2 |
7 |
12.5×2.5×32
=12.5×2.5×4×8
=(12.5×8)×(2.5×4)
=100×10
=1000
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