脱式计算,能简算要简算33.5-5.3-4.7+16.5 9900÷25÷4 &n...

2024-12-14 06:49:02
推荐回答(1个)
回答1:


(1)33.5-5.3-4.7+16.5,
=(33.5+16.5)-(5.3+4.7),
=50-10,
=40;

(2)9900÷25÷4,
=9900÷(25×4),
=9900÷100,
=99;

(3)1÷(
3
5
+
3
10
),
=1÷
9
10

=
10
9


(4)24×(
2
3
+
1
6
-
3
8
),
=24×
2
3
+24×
1
6
-24×
3
8

=16+4-9,
=20-9,
=11;

(5)1+0.45÷0.9-
7
8

=1+0.5-
7
8

=1.5-
7
8

=0.625;

(6)
20
17
-(
3
17
+
2
3
),
=
20
17
-
3
17
-
2
3

=1-
2
3

=
1
3