Question

ПОМОГИТЕ АЛГЕБРУ!!!
388,389,391

Answer 1

#388 (1-4)
$1) 9a^2-25b^2=(3a-5b)(3a+5b) \ 2) 4c^2-49d^2=(2c-7d)(2c+7d) \ 3) -81+25m^2=-(9+5m)(9-5m) \ 4) x^2y^2-0.04=(xy-0.2)(xy+0.2)$
(5-8)
$5) 0.16-x^2=(0.4-x)(0.4+x) \ 6)144-49n^2=(12-7n)(12+7n) \ 7) a^2b^2-c^2=(ab-c)(ab+c) \ 8) p^2q^2-4k^2=(pq-2k)(pq+2k)$
#389 (1-4)
$1) =30^2-1^2=899 \ 2) =(60+1)(60-1)=60^2-1=3599 \ 3) =(200-1)(200+1)=200^2-1=39999 \ 4) =(70+2)(70-2)=70^2-2^2=4896$

Answer 2

спс