S=ab
S=2м*3см=200см*3см=600см^2=<em><u>6дм^2</u></em>
(11\4+12\3-7\12):11\6=(33\12+48\12-7\12):11\6=74\12:11\6=72\12*6\11=132\12=11
24\15-41\5*(15\6-41\42)=24\15-41\5*64\42=24\15-2624\210= -1616\210
А) 23% = 0,23
<span> 15*0,23 = </span>3,45
б) 45% = 0,45
50_1/4 : 0,45 = 201/4 : 45/100 = 201/4 * 100/45 = 201/4 * 20/9 = 201*5 / 9 = 67*5 / 3=111_ 2/3
<span>в) 25:400 = 25/400 = 5/80 = 1/16 = 0,0625 = </span><span>6,25%</span>