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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