1) 8х*4.3=17.2*5.6

34.4х=96.32

х=96.32:34.4

х=2.8

2)1.9х*3.9=5.7*5.2

7.41х=29.64

х=29.64:7.41

х=4

3) 4х*4.5=3.6*5

18х=18

х=18:18

х=1

4)3х*20.4=5.1*13.2

61.2х=67.32

х=67.32:61.2

х=1.1