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简便运算8687×86139×137138-137×1138201212010×2010201125×(725+517)×1725×18+225×1711×(111-117
题目详情
简便运算
| 139×
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2012
| 25×(
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| 11×(
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|
▼优质解答
答案和解析
(1)
×86
=
×(87-1)
=
×87-
=86-
=85
(2)139×
-137×
=(138+1)×
-(138-1)×
=138×
+
-138×
+
=137-1+(
+
)
=136+1
=137
(3)2012
×
=
×
=
×
=
×
=
×
=2011
(4)25×(
+
)×17
=25×17×
+
×25×17
=119+125
=244
(5)
×18+2
×17
=
×18+6×
×17
=
×(18+6×17)
=
×220
=88
(6)11×(
-
)×17
=11×17×
-
×17×11
=17-11
=6
(7)
+
+
+
+
+…+
=1-
+
-
+
-
+
-
+
-
+…+
-
=1-
=
86 |
87 |
=
86 |
87 |
=
86 |
87 |
86 |
87 |
=86-
86 |
87 |
=85
1 |
87 |
(2)139×
137 |
138 |
1 |
138 |
=(138+1)×
137 |
138 |
1 |
138 |
=138×
137 |
138 |
137 |
138 |
1 |
138 |
1 |
138 |
=137-1+(
137 |
138 |
1 |
138 |
=136+1
=137
(3)2012
1 |
2010 |
2010 |
2011 |
=
2012×2010+1 |
2010 |
2010 |
2011 |
=
(2011+1)×2010+1 |
2010 |
2010 |
2011 |
=
2011×2010+2011 |
2010 |
2010 |
2011 |
=
2011×(2010+1) |
2010 |
2010 |
2011 |
=2011
(4)25×(
7 |
25 |
5 |
17 |
=25×17×
7 |
25 |
5 |
17 |
=119+125
=244
(5)
2 |
5 |
2 |
5 |
=
2 |
5 |
2 |
5 |
=
2 |
5 |
=
2 |
5 |
=88
(6)11×(
1 |
11 |
1 |
17 |
=11×17×
1 |
11 |
1 |
17 |
=17-11
=6
(7)
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
5×6 |
1 |
99×100 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
99 |
1 |
100 |
=1-
1 |
100 |
=
99 |
100 |
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