Math Problem Statement

Câu 3: Cho a < b. Bắt đẳng thức nào sau đây sai: A. a - 3 > b - 3 B. -3a > -3b C. a + 3 < b + 3 D. 3a < 3b Câu 4: Nghiệm của bất phương trình là: 1 - x/2 ≤ x + 5/3 A. x ≥ -4/5 B. x ≤ -4/5 C. x ≥ 4/5 D. x ≤ 4/5

Solution

Let's take a look at the questions presented in the image.

Câu 3:

We are given that a<ba < b, and we need to determine which inequality below is true:

  • A. a3>b3a - 3 > b - 3
  • B. 3a>3b-3a > -3b
  • C. a+3<b+3a + 3 < b + 3
  • D. 3a<3b3a < 3b

Câu 4:

Solve the inequality: 1x253x+5\frac{1 - \frac{x}{2}}{\frac{5}{3}} \leq x + 5 And determine the correct value of xx from the following options:

  • A. x45x \geq \frac{-4}{5}
  • B. x45x \leq \frac{-4}{5}
  • C. x45x \geq \frac{4}{5}
  • D. x45x \leq \frac{4}{5}

Would you like me to solve both questions and explain the reasoning?

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities
Linear Equations

Formulas

Solving inequalities
Transitive property of inequalities

Theorems

Properties of inequalities

Suitable Grade Level

Grades 7-9