Question

5/12 a+3/4a-1/2a при a=2,1

Answer 1

5/12а + 3/4а - 1/2а = 5/12а + 9/12а - 6/12а = 8/12а = 2/3а

при а = 2,1 = 21/10

2/3а = 2 · 2,1 : 3 = 1,4 - в десятичных дробях

2/3а = 2/3 · 21/10 = (1·7)/(1·5) = 7/5 = 1 целая 2/5 - в обыкновенных дробях

Ответ: 1 целая 2/5 или 1,4.

Answer 2

To find the value of the expression when a = 2.1, we'll substitute the value of a into the given expression and perform the calculations step by step:

Expression: 5/12a + 3/4a - 1/2a

Substitute a = 2.1 into the expression:

(5/12 * 2.1) + (3/4 * 2.1) - (1/2 * 2.1)

Now, perform the calculations:

(5/12 * 2.1) = 0.875 (3/4 * 2.1) = 1.575 (1/2 * 2.1) = 1.05

Now add the three results:

0.875 + 1.575 - 1.05 = 1.4

So, when a = 2.1, the value of the expression 5/12a + 3/4a - 1/2a is 1.4.