Question

计算下面各题：2-1/5-1/3-4/5 0.8+5/8+0.2 15-5÷16-11/16 25×5.7-5.7×24

Answer 1

你好：
(1)2-1/5-1/3-4/5
=2-4/3
=2/3

(2)0.8加5/8加0.2=1加5/8=1又5/8=13/8

(3)15-5/16-11/16
=15-1
=14

(4)25×5.7-5.7×24
=(25-24)×5.7
=5.7

如果不懂可以追问。
祝你学习进步！

Answer 2

2-1/5-1/3-4/5
=2-(1/5+4/5)-1/3
=2-1-1/3
=1-1/3
=2/3

0.8+5/8+0.2
=(0.8+0.2)+5/8

=1+5/8
=13/8

15-5÷16-11/16
=15-5/16-11/16
=15-(5/16+11/16)
=15-1
=14

25×5.7-5.7×24
=5.7×(25-24)

=5.7×1
=5.7