脱式计算,能简便的简便. 4.2-1.38+5.8-3.62 0.125×0.25×32 2 ÷ 2 3 - 2 3

2025-05-14 15:04:31
推荐回答(1个)
回答(1):

(1)4.2-1.38+5.8-3.62,
=4.2+5.8-(1.38+3.62),
=10-5,
=5;

(2)0.125×0.25×32,
=(0.125×8)×(0.25×4),
=1×1,
=1;

(3)2 ÷
2
3
-
2
3
÷2

=2×
3
2
-
2
3
×
1
2

=3 -
1
3

=2
2
3


(4)3
3
5
× 2.65-3
3
5
+3
3
5
×8.35

=3.6×(2.65+8.35-1),
=3.6×10,
=36.