1)х÷11 3/7 =1 1/20 2)х÷7 5/7=27/34 3)х÷4 3/4=2 3/19 4)9 2/7 ÷х= 1 6/7 !

Пошаговое объяснение:

1)x/11×3/7=1/20

3x/77=1/20

60x=77

x=77/60

x=1 17/60

x=1,28333

2)x/7×5/7=27/34

5x/49=27/34

170x=1323

x=1323/170

x=7 133/170

x=7/7,8235

3)x/4×3/4=6/19

3x/16=6/19

57x=96

x=32/19

x=1 13/19

x=1,68421

4)9×2/7÷x=1×6/7,x≠0

9×2/7×1/x=6/7

18/7x=6/7

126=42x

42x=126

x=3, x≠0

x=3