1) 12*0,34 = (12*34):100
2) 52*0,05 < (520*5):10
3) 0,3*0,9 = (3*9):100
4) 3,648:0,06 < 364,8:0,6
Sin15(cos65cos50+sin65sin50)=sin15*cos(65-50)=sincos15=(1/2)*2sin15cos15=(1/2)sin(2*15)=(1/2)sin30=(1/2)*(1/2)=1/4=0,25
<span>а) 4m – 6m – 3m+7+m=-4m+7</span>
<span><span>б) -8(к-3)+4(к-2)-2(3к+1)=-8k+24+4k-8-6k-2=-10k+14</span></span>