Решение на фотографии! !!!!!!!!!!!!
<span>х+x*1,5=180 ; 2,5х = 180; х = 72</span>
(а+8)^2=а^2+16а+64 2) (b-2)^2=b^2<span>-4b+4 3)(7+c)^2=49+14c+c^2 </span>4)(6-d)^2=36-12d+d^2 5)(2m+1)^2=4m^2+4m+1<span> 6)(4x-3)^2=16x^2-24x+9 </span><span>7)(5m-4n)^. 2=25m^2-40mn+16n^2 8)(10c+7d)^2=100c^2+140cd+49d^2.</span>
Домножаем на 6
2х-4-2х-2=-6
-6=-6