98. Вычислите: 1) 3/4 − (2/3)⁻¹; 2) (1/27·125⁻¹)^(1/3); 3) 27^(2/3) + 9⁻¹; 4) (0,01)⁻²:100^(1/2); 5) (64/81)^(-1/2)·(8/5)⁻¹; 6) (2 10/27)^(-2/3)·(3/4)².

3/4 − (2/3)⁻¹ = 3/4 − 3/2 = −3/4.

(1/27·125⁻¹)^(1/3) = (1/3375)^(1/3) = 1/15.

27^(2/3) + 9⁻¹ = 9 + 1/9 = 82/9.

(0,01)⁻²:100^(1/2) = 10000:10 = 1000.

(64/81)^(-1/2)·(8/5)⁻¹ = (9/8)·(5/8) = 45/64.

Смешанное число 2 10/27 = 64/27. Тогда (64/27)^(-2/3)·(3/4)² = (16/9)⁻¹·9/16 = 81/256.