V=S:t; 1)420:6=70 км/ч скорость автомобиля
<span>1) -p+2y+3p-(-2y) = 2p+4у
</span><span>2) -2(k-3)+2(13-k)= -2к+6+26-к = -3к+32
</span><span>3) -2(3k-4y)+3(2y-4k)= -6к+8у+6у-12к = -18к+14у
</span><span>4) 8-(-(5x-1)+2) = 8+(5х-1)+2 = 8+5х-1+2= 5х+9
</span><span>5) -2y+3k+y-2k+y= к
</span><span>6) -2(3-y)+3(y-2)= -6+2у+3у-6 = -12+5у
</span><span>7) -3(2y+5e)+(3e-2y)= -6у-15е+2е-2у= -8у-13е
</span><span>8) 2x+(4-(3x+5))-1 = 2х+4-(3х+5)-1 = 2х+4-3х-5-1 = -х-2</span>
Х основание
х+7 равные стороны
2(х+7)+х=44
3х+14=44
х=10см основание
10+7=17см равные стороны
<span>102-(155.4 :14.8+2.1)*3.5 =57.9</span>
<span>1)155.4:14.8=10.5</span>
<span>2)10.5+2.112.6</span>
<span>3)12.6*3.5=44.1</span>
<span>4)102-44.1=57.9</span>