Question

А) _25 (а - а) = 25_ б) _0,3а • 5b = 1,5ab_в) _3а - 4 = а + (2а - 4)_​

Answer 1

А)25(а-а)=25
а-а=1
0=1
в)3а-4=а+2а-4
3а=а+2а
3а=3а
Второи не знаю

Answer 2

Looks like you've provided three mathematical expressions with some missing values represented by underscores. To help you solve these equations, I'll fill in the missing values:

а) $25 (а - а) = 25$ Since $a - a$ equals 0, the equation simplifies to $25 \cdot 0 = 25$, which is not true. So, there's no solution for this equation.

б) $0.3а \cdot 5b = 1.5ab$ Multiplying $0.3a$ by $5b$ gives $1.5ab$, so this equation is already simplified and true for all values of $a$ and $b$.

в) $3а - 4 = а + (2а - 4)$ Start by simplifying the expression on the right side of the equation: $2a - 4$ can be simplified to $a - 4$, so the equation becomes: $3a - 4 = a + (a - 4)$ Combine the $a$ terms on the right side: $3a - 4 = 2a - 4$ Subtract $2a$ from both sides: $a - 4 = -4$ Add 4 to both sides: $a = 0$

So, the solution for this equation is $a = 0$.