题目内容
怎样算简便就怎样算:
6.4×
+6
×(1-40%);
+(
-
)÷
;
×
×15×9;
×
+
×
.
6.4×
| 2 |
| 5 |
| 2 |
| 5 |
| 5 |
| 12 |
| 5 |
| 6 |
| 1 |
| 12 |
| 9 |
| 16 |
| 14 |
| 15 |
| 2 |
| 9 |
| 2 |
| 7 |
| 5 |
| 9 |
| 4 |
| 7 |
| 2 |
| 9 |
(1)6.4×
+6
×(1-40%)
=6.4×0.4+6.4×0.6,
=6.4×(0.4+0.6),
=6.4×1,
=6.4;
(2)
+(
-
)÷
=
+(
-
)×
,
=
+
×
,
=
+
,
=
;
(3)
×
×15×9
=(
×15)×(
×9),
=14×2,
=28;
(4)
×
+
×
=
+
,
=
.
| 2 |
| 5 |
| 2 |
| 5 |
=6.4×0.4+6.4×0.6,
=6.4×(0.4+0.6),
=6.4×1,
=6.4;
(2)
| 5 |
| 12 |
| 5 |
| 6 |
| 1 |
| 12 |
| 9 |
| 16 |
=
| 5 |
| 12 |
| 10 |
| 12 |
| 1 |
| 12 |
| 16 |
| 9 |
=
| 5 |
| 12 |
| 9 |
| 12 |
| 16 |
| 9 |
=
| 5 |
| 12 |
| 16 |
| 12 |
=
| 7 |
| 4 |
(3)
| 14 |
| 15 |
| 2 |
| 9 |
=(
| 14 |
| 15 |
| 2 |
| 9 |
=14×2,
=28;
(4)
| 2 |
| 7 |
| 5 |
| 9 |
| 4 |
| 7 |
| 2 |
| 9 |
=
| 10 |
| 63 |
| 8 |
| 63 |
=
| 2 |
| 7 |
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