Question

Упростите дробь:Найдите значение дроби при

Answer 1

1.

$\displaystyle\tt\frac{a^2-8ab+16b^2}{a-4b}= \frac{(a-4b)^2}{a-4b}=a-4b\\\\npu \ a=10, \ b=3\\\\ a-4b=10-4\cdot3=10-12=-2$

2.

$\displaystyle\tt\frac{x^2-6xy+9y^2}{x-3y}=\frac{(x-3y)^2}{x-3y}=x-3y\\\\npu \ x=10, \ y=3\\\\ x-3y=10-3\cdot3=10-9=1$