题目内容

脱式计算,能简算的要简算.
(1)
3
7
-
2
5
+
4
7
-
3
5

(2)3.35×99×2+6.7
(3)
3
8
×[
8
9
÷(
5
6
-
3
4
)]

(4)
3
5
-
3
5
÷6

(5)1.7+5.02+3.98
(6)(
3
4
+
2
3
)×12

(1)
3
7
-
2
5
+
4
7
-
3
5

=(
3
7
+
4
7
)-(
2
5
+
3
5
),
=1-1,
=0;

(2)3.35×99×2+6.7,
=3.35×2×99+6.7,
=6.7×99+6.7,
=6.7×(99+1),
=6.7×100,
=670;

(3)
3
8
×[
8
9
÷(
5
6
-
3
4
)]

=
3
8
×[
8
9
÷
1
12
],
=
3
8
×
32
3

=4;

(4)
3
5
-
3
5
÷6

=10-0.1,
=9.9;

(5)1.7+5.02+3.98,
=1.7+(5.02+3.98),
=1.7+9,
=10.7;

(6)(
3
4
+
2
3
)×12

=
3
4
×12+
2
3
×12,
=9+8,
=17.
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