Question

1.2(3a+4)+3(a-7)-7(2a-7)=—5a+362.3(2x-1)-5(x-3)+6(3x-4)=19x-12​

Answer 1

Ответ:

Пошаговое объяснение:

6а+8+3а-21-14а+49= -5а+36

6а+3а-14а+5а=36-8+21-49

0=0

6х-3-5х+15+18х-24=19х-12

6х-5х+18х-19х=3-15+24-12

0=0

Answer 2

Let's simplify each of the given expressions step by step:

1. 1.2(3a+4)+3(a-7)-7(2a-7) = -5a+36

   Distribute the numbers inside the parentheses:

   • 1.2 * 3a = 3.6a
   • 1.2 * 4 = 4.8
   • 3 * a = 3a
   • 3 * (-7) = -21
   • 7 * 2a = 14a
   • 7 * (-7) = -49

   Now, combine like terms:

   3.6a + 4.8 + 3a - 21 - 14a + 49 = -5a + 32.8 - 14a = -19a + 32.8

   So, the simplified expression is: -19a + 32.8 = -5a + 36

2. 2.3(2x-1)-5(x-3)+6(3x-4) = 19x-12

   Distribute the numbers inside the parentheses:

   • 2.3 * 2x = 4.6x
   • 2.3 * (-1) = -2.3
   • 5 * x = 5x
   • 5 * (-3) = -15
   • 6 * 3x = 18x
   • 6 * (-4) = -24

   Now, combine like terms:

   4.6x - 2.3 - 5x + 15 + 18x - 24 = 19x - 12

   Combine like terms again:

   (4.6x - 5x + 18x) + (-2.3 + 15 - 24) = 17.6x - 11.3 = 19x - 12

   Now, subtract 17.6x from both sides:

   17.6x - 11.3 - 17.6x = 19x - 12 - 17.6x

   -11.3 = 1.4x - 12

   Finally, add 12 to both sides to isolate x:

   -11.3 + 12 = 1.4x - 12 + 12

   0.7 = 1.4x

   Now, divide both sides by 1.4 to solve for x:

   0.7 / 1.4 = (1.4x) / 1.4

   0.5 = x

   So, the simplified expression is: x = 0.5