Question

1.(18-х)-7(2х-4)=5х+20 2.3 (0,4у+3)-0,6у+8 3.2(2+х)+(4х-1)*3=10х-7 Решите прошу.И математика 6 класс

Answer 1

1) $(18-x)-7(2x-4)=5x+20 \\ 18-x-14x+28=5x+20 \\ -15x+46=5x+20 \\ 20x=26 \\ x=1,3$

Ответ: $1,3$

2) $3(0,4y+3)-0,6y=8 \\ 1,2y+9-0,6y=8 \\ 0,6y=-1 \\ \\ y=- \frac{1}{0,6} =- \frac{10}{6} =- \frac{5}{3} =-1 \frac{2}{3}$

Ответ: $-1 \frac{2}{3}$

3) $2(2+x)+(4x-1)3=10x-7 \\ 4+2x+12x-3=10x-7 \\ 14x+1=10x-7 \\ 4x=-8 \\ x=-2$

Ответ: $-2$

Answer 2

Solving the Equation for 6th Grade Mathematics

To solve the given equation, we'll follow the standard order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) to simplify and solve for the variable.

1. Simplify the Equation: - Start by simplifying each side of the equation separately.

For the left side of the equation: - \( (18 - x) - 7(2x - 4) \)

For the right side of the equation: - \( 5x + 20 + 2 \cdot 3 + (0.4y + 3) - 0.6y + 8 + 3 \cdot 2(2 + x) + (4x - 1) \cdot 3 \)

2. Solve for the Variable: - After simplifying both sides, we'll solve for the variable, which is typically denoted by \( x \) in this case.

Let's start by simplifying the equation step by step.

Simplifying the Left Side of the Equation

The left side of the equation is \( (18 - x) - 7(2x - 4) \).

Simplifying the Right Side of the Equation

The right side of the equation is \( 5x + 20 + 2 \cdot 3 + (0.4y + 3) - 0.6y + 8 + 3 \cdot 2(2 + x) + (4x - 1) \cdot 3 \).

I'll now simplify both sides of the equation and solve for the variable \( x \).