[tex]400 \div ( - 4) \times (12 - 2 \times 4) - ( - 7) = - 100 \times (12 - 8) + 7 = - 100 \times 4 + 7 = - 400 + 7 = - 393[/tex]
[tex] \frac{5}{8} \times 80 = 50[/tex]
[tex] \frac{1}{6} \times 42 = 7[/tex]
[tex] \frac{2}{9} \times 33 = \frac{2 \times 11}{3} = \frac{22}{3} = 7 \frac{1}{3} [/tex]
