Известно: 5x²y³ = 8. найдите:
1) 45x²y³;
2) 3x²y³;
3) -5,5x²y³;
4) 25x⁴y⁶;

1)  72;  2) 4,8;  3) - 8,8;  4) 64.

Объяснение:      5x²y³ = 8.

1) 45x²y³ = 9 × ( 5x²y³) = 9 × 8 = 72;

2) 3x²y³ = 3/5 × ( 5x²y³) = 3/5 × 8 = 24/5 = 4,8;

3) -5,5x²y³ = - 1,1 × ( 5x²y³) = - 1,1 × 8 = - 8,8  ;

4) 25x⁴y⁶ = ( 5x²y³)² = 8² =  64.