Найдите наименьшее целое решение неравенства 0,2x-1>-0,3x+1, удовлетворяющее неравенству x^2<49.

Постав лутшу відповідь
Simplifying x = 3x + -1(-9x + -1(7x + -15) + 3) + -9 Reorder the terms: x = 3x + -1(-9x + -1(-15 + 7x) + 3) + -9 x = 3x + -1(-9x + (-15 * -1 + 7x * -1) + 3) + -9 x = 3x + -1(-9x + (15 + -7x) + 3) + -9 Reorder the terms: x = 3x + -1(15 + 3 + -9x + -7x) + -9 Combine like terms: 15 + 3 = 18 x = 3x + -1(18 + -9x + -7x) + -9 Combine like terms: -9x + -7x = -16x x = 3x + -1(18 + -16x) + -9 x = 3x + (18 * -1 + -16x * -1) + -9 x = 3x + (-18 + 16x) + -9 Reorder the terms: x = -18 + -9 + 3x + 16x Combine like terms: -18 + -9 = -27 x = -27 + 3x + 16x Combine like terms: 3x + 16x = 19x x = -27 + 19x Solving x = -27 + 19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-19x' to each side of the equation. x + -19x = -27 + 19x + -19x Combine like terms: x + -19x = -18x -18x = -27 + 19x + -19x Combine like terms: 19x + -19x = 0 -18x = -27 + 0 -18x = -27 Divide each side by '-18'. x = 1.5 Simplifying x = 1.5

1) а) (a - 4)(a - 2) = a^2 - 6a + 8

б) (3x + 1)(5x - 6) = 15x^2 - 13x - 6

в) (3y - 2c)(y + 6c) = 3y^2 + 16cy - 12c^2

г) (b + 3)(b^2 + 2b - 2) = b^3 + 5b^2 + 4b - 6

2) а) 2x(a - b) + a(a - b) = (a - b)(2x + a)

б) 3x + 3y + bx + by = 3(x + y) + b(x + y) = (x + y)(3 + b)

3) 0,2y(5y^2 - 1)(2y^2 + 1) = (y^3 - 0,2y)(2y^2 + 1) =

= 2y^5 - 0,4y^3 + y^3 - 0,2y = 2y^5 + 0,6y^3 - 0,2y

4) а) 3x - xy - 3y + y^2 = x(3 - y) - y(3 - y) = (3 - y)(x - y)

б) ax - ay + cy - cx - x + y = a(x - y) - c(x - y) - (x - y) = (x - y)(a - c - 1)

5) Размеры клумбы: x и x+5 м.

Площадь дорожки 26 кв.м., а ширина 1 м. Дорожка показана на рис.

2x + 2(x+5) + 4 = 26

x + x + 5 + 2 = 13

2x = 13 - 7 = 6

x = 3 м - ширина клумбы.

x + 5 = 3 = 5 = 8 м - длина клумбы.