脱式计算(能用简便算法的,要写出简便过程)24×10.5-3549÷39 710÷[(35-14)×12]2-58÷2528-310 815÷16-715×6.
(1)24×10.5-3549÷39,
=24×(10+0.5)-91,
=240+12-91,,
=252-91,
=161;
(2)
÷[(
?
)×12],
=
÷[(
-
)×12],
=
÷[
×12],
=
÷
,
=
×
,
=
;
(3)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(4)
÷
?
×6,
=
×6-
×6,
=(
?
)×6,
=
×6,
=
.
=24×(10+0.5)-91,
=240+12-91,,
=252-91,
=161;
(2)
7 |
10 |
3 |
5 |
1 |
4 |
=
7 |
10 |
12 |
20 |
5 |
20 |
=
7 |
10 |
7 |
20 |
=
7 |
10 |
21 |
5 |
=
7 |
10 |
5 |
21 |
=
1 |
6 |
(3)2-
5 |
8 |
25 |
28 |
3 |
10 |
=2-
5 |
8 |
28 |
25 |
3 |
10 |
=2-
7 |
10 |
3 |
10 |
=2-(
7 |
10 |
3 |
10 |
=2-1,
=1;
(4)
8 |
15 |
1 |
6 |
7 |
15 |
=
8 |
15 |
7 |
15 |
=(
8 |
15 |
7 |
15 |
=
1 |
15 |
=
2 |
5 |
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