Question

А) 10а+2,5 при: а =0,3 б) (/ это дробь) 1/3аб при: а=0,5 б=0,6 в) (2) во второй степени) 2х(2)-10 при: х=2,5

Answer 1

10*0.3+2.5=3+2.5=5.5
1/3*0.5+1/3*06=5/6+1/5=

Answer 2

$10 \times 0.3 + 2.5 = 5.5 \\ \frac{1}{3 \times 0.5 \times 0.6 } = \frac{1}{0.9} = 1.(1) \\ 2 \times {2.5}^{2} - 10 = 2 \times 6.25 - 10 = 12.5 - 10 = 2.5$

Answer 3

а) To evaluate the expression 10a + 2.5 when a = 0.3:

10(0.3) + 2.5 = 3 + 2.5 = 5.5

Therefore, when a = 0.3, the value of the expression 10a + 2.5 is 5.5.

б) To evaluate the expression (1/3)ab when a = 0.5 and b = 0.6:

(1/3)(0.5)(0.6) = 0.1

Therefore, when a = 0.5 and b = 0.6, the value of the expression (1/3)ab is 0.1.

в) To evaluate the expression (2^2)x(2) - 10 when x = 2.5:

(2^2)(2.5) - 10 = 4(2.5) - 10 = 10 - 10 = 0

Therefore, when x = 2.5, the value of the expression (2^2)x(2) - 10 is 0.