题目内容
| 怎样简便就怎样算. 49.5×0.2+2.07÷23 | 1350+450÷15×25 |
| ||||||||||||||||||
(0.75-
|
| [4-(
|
(1)49.5×0.2+2.07÷23,
=9.9+0.09,
=9.99;
(2)1350+450÷15×25,
=1350+30×25,
=1350+750,
=2100;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)(0.75-
)×(
+
),
=(
-
)×(
+
),
=(
-
)×
,
=
×
,
=
;
(5)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
×
,
=
;
(6)[4-(
-
)]×
,
=[4-(
-
)]×
,
=[4-
]×
,
=
×
,
=
.
=9.9+0.09,
=9.99;
(2)1350+450÷15×25,
=1350+30×25,
=1350+750,
=2100;
(3)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(4)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 3 |
| 9 |
=(
| 12 |
| 16 |
| 3 |
| 16 |
| 5 |
| 9 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
(5)
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 8 |
(6)[4-(
| 3 |
| 4 |
| 3 |
| 8 |
| 4 |
| 29 |
=[4-(
| 6 |
| 8 |
| 3 |
| 8 |
| 4 |
| 29 |
=[4-
| 3 |
| 8 |
| 4 |
| 29 |
=
| 29 |
| 8 |
| 4 |
| 29 |
=
| 1 |
| 2 |
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