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计算.(能简算的要简算)64×6465256×254255-254×1255112+56-712+920-113012+16+112+120+130+142.
题目详情
计算.(能简算的要简算)
64×
256×
-254×
1
+
-
+
-
+
+
+
+
+
.
64×
64 |
65 |
256×
254 |
255 |
1 |
255 |
1
1 |
2 |
5 |
6 |
7 |
12 |
9 |
20 |
11 |
30 |
1 |
2 |
1 |
6 |
1 |
12 |
1 |
20 |
1 |
30 |
1 |
42 |
▼优质解答
答案和解析
(1)64×
=(65-1)×
=65×
-1×
=64-
=63
;
(2)256×
-254×
=256×
-
×1
=(256-1)×
=255×
=254
(3)1
+
-
+
-
=1
+(
+
)-(
+
)+(
+
)-(
+
)
=1
+
+
-
+
-
+
-
=2-
=1
(4)
+
+
+
+
+
=(1-
)+(
−
)+(
-
)+(
-
)+(
-
)+(
-
)
=1-
+
−
+
-
+
-
+
-
+
-
=1-
=
.
64 |
65 |
=(65-1)×
64 |
65 |
=65×
64 |
65 |
64 |
65 |
=64-
64 |
65 |
=63
1 |
65 |
(2)256×
254 |
255 |
1 |
255 |
=256×
254 |
255 |
254 |
255 |
=(256-1)×
254 |
255 |
=255×
254 |
255 |
=254
(3)1
1 |
2 |
5 |
6 |
7 |
12 |
9 |
20 |
11 |
30 |
=1
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
=1
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
6 |
=2-
1 |
6 |
=1
5 |
6 |
(4)
1 |
2 |
1 |
6 |
1 |
12 |
1 |
20 |
1 |
30 |
1 |
42 |
=(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
=1-
1 |
7 |
=
6 |
7 |
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