[tex]8.9 \times 7.3 = 64.97[/tex]

а)

[tex]89 \times 7.3 = 10 \times 8.9 \times7.3 = 10 \times 64.97 = \\ 649.7[/tex]

б)

[tex]8.9 \times 73 = 8.9 \times 7.3 \times 10 = 64.97 \times 10 = \\ 649.7[/tex]

в) и г)

[tex]8.9 \times 0.73 = 8.9 \times 7.3 \times 0.1= \\ 64.97 \times 0.1 = 6.497[/tex]

д)

[tex]8.9 \times 0.0073 = 8.9 \times 7.3 \times 0.001 = \\ 64.97 \times 0.001 = 0.06497[/tex]

е)

[tex]89 \times 0.73 = 10 \times 8.9 \times 7.3 \times 0.1 = \\ 64.97[/tex]

ё)

[tex]0.89 \times 0.73 = 0.1 \times 8.9 \times 7.3 \times 0.1 = \\ 64.9 7\times 0.01 = 0.6497[/tex]

ж)

[tex]890 \times 7.3 = 100 \times 8.9 \times 7.3 = \\ 100 \times 64.97 = 6497[/tex]