<span>3a-1/4b-5a-3/4b= -2a-(-1)= -2a+1</span>
Длину стороны квадрата умножаем на ее саму
1/4+7/100=<span>25*1/25*4</span>+<span>1*7/1 *100</span>=<span>25/100</span>+<span>7/100</span>=<span>25 + 7/100</span>=<span>32/100</span>= <span>8*4/25* 4 </span>= <span>8/25</span><span> =0,32</span>