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Ответ:

0,8х= 3,2

0.8х÷0.8=3.2÷0.8

х=4

1,2x = 0,36

1.2х÷1.2-0.36÷1.2

х=0.36÷1.2

х=0.3

х=3/10

х=3×10⁻¹

х:0,4=5,2

х÷2/5=5.2

х×2/5=5.2

5/2х=5.2

х=2/5×5.2

х=2/5×26/5

х=52/25

х=2 2/25

х:1,4=2,5

х÷7/5=2.5

х×5/7=2.5

5/7х=2.5

х=7/5×2.5

х=7/5×5/2

х=7×1/2

х=7/2

х= 3 1/2

х=3.5