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julymosiy4uck
@julymosiy4uck
July 2022
2
1
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розвяжи рівняння
а)8(х-4)+3(2-х)=-21
б)2(3у+4)-(9у-7)=15
в)3(2а-5)-2(3-4а)=0
г)-4(0,3к-0,4)+6(-0,8к+0,2)=0
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jekadva
а)
8(х-4)+3(2-х)=-21
8x-32+6-3x=-21
5x-26=-21
5x=-21+26
5x=5
x=1
б)
2(3у+4)-(9у-7)=15
6y+8-9y+7=15
-3y+15=15
-3y=15-15
-3y=0
y=0
в)
3(2а-5)-2(3-4а)=0
6a-15-6+8a=0
14a-21=0
14a=21
a=1,5
г)
-4(0,3к-0,4)+6(-0,8к+0,2)=0
-1,2k+1,6-4,8k+1,2=0
-6k+2,8=0
6k=2,8
k=2,8:6
k=7/15
0 votes
Thanks 0
HelperBodia
А) Відкриємо дужки:
8х-32+6-3х=-21
5х -26 =-21
5х =5
х=1
Б)6у+8-9у+7=15
-3у=15-8-7
-3у=0
у=0
В)6а -15-6+8а=0
14а =21
а=21/14 =3/2
Г)-1.2к+1.6-4.8к+1.2=0
-6к +2.8=0
2.8=6к
у=2.8/6
0 votes
Thanks 0
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Answers & Comments
8(х-4)+3(2-х)=-21
8x-32+6-3x=-21
5x-26=-21
5x=-21+26
5x=5
x=1
б)
2(3у+4)-(9у-7)=15
6y+8-9y+7=15
-3y+15=15
-3y=15-15
-3y=0
y=0
в)
3(2а-5)-2(3-4а)=0
6a-15-6+8a=0
14a-21=0
14a=21
a=1,5
г)
-4(0,3к-0,4)+6(-0,8к+0,2)=0
-1,2k+1,6-4,8k+1,2=0
-6k+2,8=0
6k=2,8
k=2,8:6
k=7/15
8х-32+6-3х=-21
5х -26 =-21
5х =5
х=1
Б)6у+8-9у+7=15
-3у=15-8-7
-3у=0
у=0
В)6а -15-6+8а=0
14а =21
а=21/14 =3/2
Г)-1.2к+1.6-4.8к+1.2=0
-6к +2.8=0
2.8=6к
у=2.8/6