Question

пожалуйста , помогите упростить выражение)

Answer 1

(1025-b²-15+b+15-b)*(25-10b+b²)=
1. 10-5+b+5+b(5-b)(5+b)=10+2b(5-b)(5+b)=2(5+b)(5-b)(5+b)=2(5-b)
2.25-10b+b²=5-b
3.2(5-b)*(5-b)=2

Answer 2

$(frac{10}{25-b^2} - frac{1}{5+b} + frac{1}{5-b} )*(25-10b+b^2)= frac{10-5+b+5+b}{(5-b)*(5+b)} *(5-b)^2$=((10+2b)*(5-b))/(5+b)=(2*(5+b)*(5-b))/(5+b)=2*(5-b)=10-2b