脱式计算(能简算要用简便方法计算).(1)56×( 3 7 - 3 8 ) (2)9.75-3.42

脱式计算(能简算要用简便方法计算).(1)56×( 3 7 - 3 8 ) (2)9.75-3.42-5.58 (3)2.1×0.5÷4.2 (4) 3 8 × 6 7 + 6 7 ÷8 (5)(1- 8 15 × 1 2 )÷ 4 5 (6)35÷[( 5 6 - 2 3 )×3].

(1)56×(
3
7
-
3
8
),
=56×
3
7
-56×
3
8

=24-21,
=3;

(2)9.75-3.42-5.58,
=9.75-(3.42+5.58),
=9.75-9,
=0.75;

(3)2.1×0.5÷4.2,
=2.1÷4.2×0.5,
=0.5×0.5,
=0.25;
(4)
3
8
×
6
7
+
6
7
÷8,
=(
3
8
+
1
8
)×
6
7

=
1
2
×
6
7

=
3
7
(5)(1-
8
15
×
1
2
)÷
4
5

=
11
15
×
5
4

=
11
12


(6)35÷[(
5
6
-
2
3
)×3],
=35÷[
1
6
×3],
=35×2,
=70.
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