题目内容
下面各题怎么简便怎么算.
×(
-
)÷
;
78÷[32×(1-
)+144];
×
-
×
;
0.32×2.5×0.125.
| 8 |
| 9 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
78÷[32×(1-
| 5 |
| 8 |
| 7 |
| 15 |
| 4 |
| 5 |
| 2 |
| 15 |
| 4 |
| 5 |
0.32×2.5×0.125.
(1)
×(
-
)÷
=
×
×2,
=
;
(2)78÷[32×(1-
)+144]
=78÷[32×
+144],
=78÷[12+144],
=78÷156,
=0.5;
(3)
×
-
×
=(
-
)×
,
=
×
,
=
;
(4)0.32×2.5×0.125
=0.4×0.8×2.5×0.125,
=(0.4×2.5)×(0.8×0.125),
=1×0.1,
=0.1.
| 8 |
| 9 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 8 |
| 9 |
| 3 |
| 16 |
=
| 1 |
| 3 |
(2)78÷[32×(1-
| 5 |
| 8 |
=78÷[32×
| 3 |
| 8 |
=78÷[12+144],
=78÷156,
=0.5;
(3)
| 7 |
| 15 |
| 4 |
| 5 |
| 2 |
| 15 |
| 4 |
| 5 |
=(
| 7 |
| 15 |
| 2 |
| 15 |
| 4 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 5 |
=
| 4 |
| 15 |
(4)0.32×2.5×0.125
=0.4×0.8×2.5×0.125,
=(0.4×2.5)×(0.8×0.125),
=1×0.1,
=0.1.
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