Question

Помогите с 1 вариантом срочно!

Answer 1

1. а. 3/4+1/8=3×2/4×2+1/8=6/8+1/8= 6+1/8= 7/8
б.11/15-7/20=11×4/15×4-7×3/20×3= 44/60-21/60= 44-21/60 =23/60
в. 5/4×2/3=5×2/4×3=10/12=5×2/6×2=5/6
г. 3/20÷9/10=3/20×10/9=3×10/20×9=30/180=1×30/6×30=1/6
д. 2 2/5+3