(46.4-2x)/0.2=6
46.4-2x=0.2*6
46.4-2x=1.2
2x=46.4-1.2
2x=45.2
x=45.2/2
x==22.6
Видно конечно очень плохо.....
1) 9*2=18лам.-красных
2) 18+9=27лам.-всего
Ответ:27 лампочек
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1) 9*3+9=36 подарков
1). 543+177=720
2). 401* 2= 802
3). 802-720=82
5x+15=14x-7
7+15=14x+5x
22=19x
x=22/19
x=1 3/19
1. 1)<span>2*3х = 6х</span>
<span>2) <span>-а*(-5) = 5а</span></span>
<span><span>3) <span>4аб*7 = 28аб</span></span></span>
<span><span><span>4) 13м * 3н = 39мн</span></span></span>
<span><span><span>2. 1)<span>(х-у+с)*6 = 6х - 6у + 6с</span></span></span></span>
<span><span><span><span>2) <span>-8(а+б-н) = -8а - 8б + 8н</span></span></span></span></span>
<span><span><span><span><span>3. <span> 1)-9х+5х-3х+9х = 2х</span></span></span></span></span></span>
<span><span><span><span><span><span>2) <span>3х+5у-7х+4у = 9у - 4х</span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span>3)-3м+7н+3м-7м = <span>7н-7м</span></span></span></span></span></span></span></span></span>