题目内容
用简便方法计算. 他大×
| 1大×
| ||||||||
101×
| (12+
|
(1)47×
=(46+1)×
=46×
+
=r7+
=r7
;
(r)17×
+17÷
=17×
+17×
=17×(
+
)
=17×1
=17;
(3)101×
-
=(101-1)×
=100×
=
;
(4)(13+
)×
=13×
+
×
=r
+
=r
.
r7 |
46 |
=(46+1)×
r7 |
46 |
=46×
r7 |
46 |
r7 |
46 |
=r7+
r7 |
46 |
=r7
r7 |
46 |
(r)17×
11 |
r3 |
r3 |
1r |
=17×
11 |
r3 |
1r |
r3 |
=17×(
11 |
r3 |
1r |
r3 |
=17×1
=17;
(3)101×
3 |
7 |
3 |
7 |
=(101-1)×
3 |
7 |
=100×
3 |
7 |
=
300 |
7 |
(4)(13+
4 |
z |
z |
r6 |
=13×
z |
r6 |
4 |
z |
z |
r6 |
=r
1 |
r |
r |
13 |
=r
17 |
r6 |
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