<span>1</span><span>) 32</span><span>- 12</span><span>20 (</span><span>грн) -</span><span>різниця</span><span>2</span><span>)</span><span>60:</span><span>20</span><span>=</span><span>3</span><span>(грн</span><span>) -</span><span>вартує одна</span><span>ручка.</span><span>3</span><span>) 32</span><span>*</span><span>3</span><span>= 96</span><span>(грн</span><span>) -</span><span>заплатили</span><span>за</span><span>прості</span><span>ручки.</span><span>4</span><span>) 12</span><span>*</span><span>3</span><span>= 26</span><span>(грн</span><span>) -</span><span>заплатили</span><span>за</span><span>гелівие</span><span>ручки</span>
АС=х; СВ=33-х
0.4х= 1/3*(33-х)
2/5*х=11-1/3*х
11/15*х=11
х=15
Ответ:15 см
(3x-1)^2-25x^2=0
(3x-1-25x)(3x-1+25x)=0
(-22x-1)(28x-1)=0
-22x-1=0 или 28x-1=0
-22x=1 28x=1
дальше сам