Ask people to teach edition seven grade two mathematics page 47-48 answer, thank you

Ask people to teach edition seven grade two mathematics page 47-48 answer, thank you

Page 47 1. (1) 9 (2) 5 / 8 (3) 0.2 (4) 102. (1) meaningful (2) meaningless (negative number has no arithmetic square root) (3) meaningful (4) meaningful 3. (1) ± 7 (2) ± 2 / 5 (3) ± 1 / 10 cubic power (4) ± 0.044. (1), (2), (4) correct (3) incorrect 5