<span>1) 8у-3(2у-3)=7у-2(5у+8);</span>
8y-6y+9=7y-10y-16
8y-6y -7y+10y=-16-9
5y=-25
y=-25/5
y=-5
<span>2)5(2у-9)+6у=4(3у-2)-21;
10y-45+6y=12y-8-21
10y+6y-12y=45-29
4y=16
y=16/4
y=4</span>
<span><span>3)5у+7(3-у)=3(5-2у)-6;</span></span>
<span><span>5y+21-7y=15-6y-6
5y-7y+6y=9-21
4y=-12
y=-12/4</span></span>
<span><span>y=-3
</span></span>
<span><span><span>4)7у-4(3у+5)=2-3(4у-9)</span></span></span>
<span><span><span>7y-12y-20=2-12y+27
7y-12y+12y=2+27+20
7y=49
y=49/7</span></span></span>
<span><span><span>y=7 </span></span></span>
<span> </span>
48056 32016+ 350021
+ + +
18021=66077 48024=80040 250015=600036
Ответ: да, торт съели весь
Градусная мера развернутого угла=180°
MPA-X
APK-X/2
X/2+X=180
1,5X=180:1,5
X=120°-MPA
APK=120/2=60°