这二题怎么写啊！要算式哦！

Question

如题所述

Answer 1

3.、
1. 2/3+5/8x2/5
=2/3+2/8
=2/3+1/4
=8/12+3/12
=11/12
2. 5/3-2/7-5/7
=5/3-(2/7+5/7)
=5/3-1
=2/3
3. (7/6-5/9)÷11/8
=(21/18-10/18)÷11/8
=11/18x8/11
=4/9
4. 5÷5/7-5/7x1/5
=5x7/5-1/7
=7-1/7
=48/7
5. 5/12x1/5+4/5x5/12
=1/12+4/12
=5/12
6. 8/9÷[(2/5+1/10)x4/3]
= 8/9÷[(4/10+1/10)x4/3]
= 8/9÷[5/10x4/3]
=8/9÷(1/2x4/3)
=8/9÷2/3
=8/9x3/2
=4/3

4、
28/21
=(4x7)/(3x7)
=4/3

300:125
=60:25
=12:5

0.45:0.9
=0.15:0.3
=0.05:0.1
=5:10
=1:2

3.6:9
=36:90
=4:10
=2:5