Question

1)(3a-4b)+(-6a+7b) 2)(5x-2)+(-3x+2) 3)4x²+(5y²-3x²) 4)1,2a²+(-4,8b²+1,9a²)+3,6b²

Answer 1

1)-3a+3b

2)2x

3)x2+5y2

4)3,1a2-1,2b2

Answer 2

Let's simplify each of the given expressions:

1. (3a-4b)+(-6a+7b) = 3a - 4b - 6a + 7b = (3a - 6a) + (-4b + 7b) = -3a + 3b

2. (5x-2)+(-3x+2) = 5x - 2 - 3x + 2 = (5x - 3x) + (-2 + 2) = 2x

3. 4x² + (5y²-3x²) = 4x² + 5y² - 3x² = (4x² - 3x²) + 5y² = x² + 5y²

4. 1,2a² + (-4,8b²+1,9a²) + 3,6b² = 1.2a² - 4.8b² + 1.9a² + 3.6b² = (1.2a² + 1.9a²) + (-4.8b² + 3.6b²) = 3.1a² - 1.2b²

Note: In the fourth expression, I assumed that the comma (,) represents a decimal point.