Question

(1,8 -0,3у) *(2у+9)=0

Answer 1

1,8-0,3y=0 или 2y+9=0. -0,3y= -1,8; y1=(-1,8)/(-0,3)=6. 2y= -9, y2=(-9)/2= -4,5. Ответ: y1=6, y2= -4,5.

Answer 2

1,8-0,3у×2у+9=0
1,8-0,6у+9=0
-0,6у=-9-1,8
-0,6у=-10,8
У=-10,8÷(-0,6)
У=18
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Ответ:18

Answer 3

To solve the equation (1,8 - 0,3у) * (2у + 9) = 0, we need to find the values of у (y) that make the equation true. To do this, we set each factor to zero and solve for y.

Step 1: Set the first factor to zero: 1,8 - 0,3у = 0

Step 2: Solve for y: 1,8 = 0,3у у = 1,8 / 0,3 у = 6

Now, let's check the second factor:

Step 1: Set the second factor to zero: 2у + 9 = 0

Step 2: Solve for y: 2у = -9 у = -9 / 2 у = -4.5

Now we have two values of у (y): у = 6 and у = -4.5.

To check if these values are solutions to the original equation, substitute them back into the equation:

For у = 6: (1,8 - 0,3 * 6) * (2 * 6 + 9) = (1,8 - 1,8) * (12 + 9) = 0 * 21 = 0

For у = -4.5: (1,8 - 0,3 * (-4.5)) * (2 * (-4.5) + 9) = (1,8 + 1,35) * (-9 + 9) = 3,15 * 0 = 0

Both values of y satisfy the equation, so the solutions are у = 6 and у = -4.5.