题目内容
| 怎样简便就怎样计算. (21+
|
| ||||||||||||
1
|
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| (八.8-7
|
(1)(71+
)×
=71×
+
×
=3+
=3
;
(7)
×
+
×
=
×(
+
)
=
×1
=
;
(3)1
×x.83-
×x.83
=(1
-
)×x.83
=1×x.83
=x.83;
(4)
+
+
+
=
+
+(
+
)
=
+
=
;
(8)
×(
+
)÷
=
×
×17
=
;
(6)(4.8-7
÷7.8)÷
=(4.8-3)÷
=1.8×17
=71.6.
| 7 |
| 13 |
| 1 |
| 7 |
=71×
| 1 |
| 7 |
| 7 |
| 13 |
| 1 |
| 7 |
=3+
| 1 |
| 13 |
=3
| 1 |
| 13 |
(7)
| 4 |
| 8 |
| 7 |
| x |
| 7 |
| 8 |
| 4 |
| x |
=
| 4 |
| 8 |
| 7 |
| x |
| 7 |
| x |
=
| 4 |
| 8 |
=
| 4 |
| 8 |
(3)1
| 8 |
| 8 |
| 8 |
| 8 |
=(1
| 8 |
| 8 |
| 8 |
| 8 |
=1×x.83
=x.83;
(4)
| 7 |
| x |
| 7 |
| 16 |
| 4 |
| x |
| 8 |
| 16 |
=
| 7 |
| x |
| 4 |
| x |
| 8 |
| 16 |
| 7 |
| 16 |
=
| 7 |
| 3 |
| 3 |
| 4 |
=
| 17 |
| 17 |
(8)
| 1 |
| 18 |
| 1 |
| 3 |
| 1 |
| 17 |
| 1 |
| 17 |
=
| 1 |
| 18 |
| 8 |
| 17 |
=
| 1 |
| 3 |
(6)(4.8-7
| 1 |
| 7 |
| 1 |
| 17 |
=(4.8-3)÷
| 1 |
| 17 |
=1.8×17
=71.6.
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