
计算尽量用简便方法(1)32.5+3.6×2.5÷0.48 ...
计算尽量用简便方法(1)32.5+3.6×2.5÷0.48(2)22-34×12-58(3)299÷(299+299300)(4)[138-(58+57)]×34....
计算尽量用简便方法(1)32.5+3.6×2.5÷0.48 (2)22-34×12-58(3)299÷(299+299300) (4)[138-(58+57)]×34.
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(1)32.5+3.6×2.5÷0.48,
=32.5+9÷0.48,
=32.5+18.75,
=51.25;
(2)22-
×
-
,
=22-
-
,
=22-(
+
),
=22-1,
=21;
(3)299÷(299+
),
=299÷
,
=299×
,
=
,
=
;
(4)[
-(
+
)]×
,
=[
-
-
]×
,
=[1-
]×
,
=
×
,
=
.
=32.5+9÷0.48,
=32.5+18.75,
=51.25;
(2)22-
3 |
4 |
1 |
2 |
5 |
8 |
=22-
3 |
8 |
5 |
8 |
=22-(
3 |
8 |
5 |
8 |
=22-1,
=21;
(3)299÷(299+
299 |
300 |
=299÷
299×300+299 |
300 |
=299×
300 |
299×300+299 |
=
300 |
300+1 |
=
300 |
301 |
(4)[
13 |
8 |
5 |
8 |
5 |
7 |
3 |
4 |
=[
13 |
8 |
5 |
8 |
5 |
7 |
3 |
4 |
=[1-
5 |
7 |
3 |
4 |
=
2 |
7 |
3 |
4 |
=
3 |
14 |
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