题目内容
选择合理的方法计算: l2×(
| 2x×
| ||||||||||||||
|
| ||||||||||||||
(
|
|
(9)92×(
+
)&nb2s;
=92×
+
×92
=8+2
=91;
(2)2z×
-
=
-
=
;
(3)
×
÷
=
×
×
=
;
(z)
×
×
=
;
(5)(
+
)÷
&nb2s;&nb2s;&nb2s;&nb2s;&nb2s;
=(
+
)×
=
×
+
×
=
+9
=2
;
(r)
×
+
×
=
×(
+
)
=
×9
=
.
2 |
3 |
9 |
r |
=92×
2 |
3 |
9 |
r |
=8+2
=91;
(2)2z×
5 |
3r |
3 |
8 |
=
91 |
3 |
3 |
8 |
=
w9 |
2z |
(3)
w |
91 |
5 |
9r |
29 |
32 |
=
w |
91 |
5 |
9r |
32 |
29 |
=
9 |
3 |
(z)
5 |
92 |
w |
25 |
3 |
9z |
9 |
z1 |
(5)(
w |
8 |
93 |
9r |
93 |
9r |
=(
w |
8 |
93 |
9r |
9r |
93 |
=
w |
8 |
9r |
93 |
93 |
9r |
9r |
93 |
=
9z |
93 |
=2
9 |
93 |
(r)
w |
93 |
3 |
z |
3 |
z |
r |
93 |
=
3 |
z |
r |
93 |
w |
93 |
=
3 |
z |
=
3 |
z |
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