How to calculate 100 * 7.9 + 184 * 2.1 + 84 * 2.9

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• 2. If the absolute value of a = 3, the absolute value of B = 5, and a is different from B, then the absolute value of (a-b) =?
• 3. The image of the function f (x) = | x + 1 | + | x-a | (x ∈ R, a is a constant) is symmetric about the y-axis The image of the function f (x) = ┃ x + 1 ┃ + ┃ x-a ┃ (x ∈ R, a is a constant) is symmetric about the Y axis. (1) find the value of a (2) Let G (x) = f (x-t) - f (x + T), judge the parity of G (x), and give the proof
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• 6. In △ ABC, BC = 14, ab = 15. It is known that the area of △ ABC is 84, and the length of AC is obtained What's inside? I won't draw any pictures,
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• 9. Given a + B = 3 and A-B = - 1, what is the sum of the square of a and the square of B? Thank you very much
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• 12. Given that point a (a-2,2b + 1) is a point in Cartesian coordinate system, its symmetric point about origin is B (- 2, - 5), try to find the arithmetic square root of ab The process of calculation
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• 19. It is known that the equation of X, where the square of x plus (2m minus 1) x plus the square of M is equal to 0, has two real roots x 1 and x 2
• 20. The perimeter of a rectangle is 24cm. If the length of the rectangle is reduced by 2cm and the width is increased by 3cm, it will become a square. Find the area of the original rectangle? Use x solution