Question

Если 2а-b=505 и 3b-c=333, то 4а+7b-3c равно-?

Answer 1

4а+7b-3c=4a-2b+9b-3c=2(2a-b)+3(3b-c)=2*505+3*333=1010+999=2009

Answer 2

To find the value of 4a + 7b - 3c, we need to solve the given equations:

1. 2a - b = 505
2. 3b - c = 333

We can do this by first finding the values of 'a,' 'b,' and 'c' and then substituting them into the expression 4a + 7b - 3c.

Step 1: Solve the equations to find the values of 'a,' 'b,' and 'c.' From equation 1, we can express 'b' in terms of 'a': 2a - b = 505 b = 2a - 505

Now, substitute the value of 'b' in equation 2: 3b - c = 333 3(2a - 505) - c = 333 6a - 1515 - c = 333 c = 6a - 1848

Step 2: Substitute the values of 'b' and 'c' into the expression 4a + 7b - 3c. 4a + 7b - 3c = 4a + 7(2a - 505) - 3(6a - 1848) 4a + 14a - 3535 - 18a + 5544

Step 3: Simplify the expression: Combine 'a' terms: 4a + 14a - 18a = 0 4a + 14a - 18a = 0

Now, combine the constants: -3535 + 5544 = 2009

So, 4a + 7b - 3c equals 2009.