脱式计算. 17.3-4.8+5.2 9× 2 7 + 5 7 ×9 (1- 8 15 ×

脱式计算. 17.3-4.8+5.2 9× 2 7 + 5 7 ×9 (1- 8 15 × 1 2 )÷ 4 5 1.6×[1÷(2.1-2.09)].
2025-03-06 02:05:20
推荐回答(1个)
回答1:

(1)17.3-4.8+5.2,
=12.5+5.2,
=17.7;

(2)9×
2
7
+
5
7
×9,
=9×(
2
7
+
5
7
),
=9×1,
=9;

(3)(1-
8
15
×
1
2
)÷
4
5

=(1-
4
15
)×
5
4

=
11
15
×
5
4

=
11
12


(4)1.6×[1÷(2.1-2.09)],
=1.6×[1÷0.01],
=1.6×100,
=160.