1.20:3/4= 2.36:6/7= 3.4,8:0,6= 4.7,2:0,8=

1. =20:3/4
    =20×4/3
    =80/3
    =26 2/3

2. =36:6/7
    =36×7/6
    =6×7
    =42

3. =4,8:0,6
    =48/10:6/10
    =48/10×10/6
    =48/6
    =8

4. =7,2:0,8
    =72/10:8/10
    =72/10×10/8
    =72/8
    =9

1.20 :3/4 = 26,6
2. 36:6/7=36×7/6=36×7/6=42
3.4,8:0,6= 48/10:6/10=48/10×10/6=8
4. 7,2:0,8=72/10 : 8/10 =72/10×10/8=9