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12: 4 / 3 2 / 9:4 / 3 3.2:0.8 42:7 25 / 125 2.48:80 reduction ratio

12: 4 / 3 2 / 9:4 / 3 3.2:0.8 42:7 25 / 125 2.48:80 reduction ratio

12：4/3
=12×3/4:4/3×3/4
=9:1
2/9:4/3
=2/9×9/2:4/3×9/2
=1:6
3.2:0.8
=4:1
42:7
=6:1
25/125
=1:5
2.48:80
=2.48÷8:80÷8
=0.31:10
=31:1000

Simple calculation of 7 / 2-7 / 2 * 15 / 8

7/2-7/2*15/8=7/2*(1-15/8)=7/2*15/7=15/2

How to calculate 18 × 23-23 × 8

18×23-23×8
=(18-8)×23
=10×23
=230

(- 3 / 7) × (- 0.125) × 1 / 18 × | - 80 | how to do

(-3/7)×(-0.125)×1/18×|-80|
=3/7*1/8*1/18*80
=(3*10)/(7*18)
=5/21