Question

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class - 8 chapter - cube and cubes root ​

Answer 1

Answer:

1.

(a) 5×5×5=152

(b) 20×20×20=8000

(c) -33×-33×-33=-35,937

(d) -51×-51×-51=-132,651

(e) -1.5×-1.5×-1.5-3.375

(f) 2/7×2/7×2/7=8/343

2.

(a) 15×15×15=3375

(b) 60×60×60=36000

(b) 3.1×3.1×3.1=29.791

(d) 3/5×3/5×3/5=27/125

Answer 2

1) (a) 5³ = 5 x 5 x 5 = 25 x 5 = 125.

(b) 20³ = 20 x 20 x 20 = 400 x 20 = 8000.

(c) -33³ = -33 x -33 x -33 = 1089 x - 33 = -35937.

(d) -51³ = -51 x -51 x -51 = 2601 x - 51 = -132651.

(e) -1.5³ = -1.5 x -1.5 x -1.5 = 2.25 x -1.5 = -3.375.

(f) 2/7³ = 2³/7³ = 2 x 2 x 2/7 x 7 x 7 = 8/49.

2) (a) Cube of 15 = 15 x 15 x 15 = 225 x 15 = 3375.

(b) Cube of 60 = 60 x 60 x 60 = 3600 x 60 = 216000.

(c) Cube of 3.1 = 3.1 x 3.1 x 3.1 = 9.61 x 3.1 = 29.791.

(d) Cube of 3/5 = 3 x 3 x 3/5 x 5 x 5 = 27/125.