70 баллов.
1) 9 - 7y = 25 - 3y
2) -2n = 5,6n
3) 2(11 - 4a) = 3 - (5a +2)
4) 3(-5 +c) -2(c - 4) = 2 -7(c - 1)
5) [tex] \frac{x}{3} + 5 = \frac{x}{4} + 3[/tex]\
6) 1,2d - 0,5(4d - 1) = -0,7(d - 2)
7) [tex] \frac{y}{9} - (y + \frac{1}{3}) = \frac{1}{6} - ( \frac{8y}{9} + 0,5)[/tex]
8) [tex] \frac{a - 3,2}{2a+1,4} = \frac{0,9}{2,7} [/tex]
1) 9 - 7y = 25 - 3y
2) -2n = 5,6n
3) 2(11 - 4a) = 3 - (5a +2)
4) 3(-5 +c) -2(c - 4) = 2 -7(c - 1)
5) [tex] \frac{x}{3} + 5 = \frac{x}{4} + 3[/tex]\
6) 1,2d - 0,5(4d - 1) = -0,7(d - 2)
7) [tex] \frac{y}{9} - (y + \frac{1}{3}) = \frac{1}{6} - ( \frac{8y}{9} + 0,5)[/tex]
8) [tex] \frac{a - 3,2}{2a+1,4} = \frac{0,9}{2,7} [/tex]
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Answers & Comments
-4у=16 n=0
у=-4
3) 2(11-4a)=3-(5a+2)
22-8a=3-5a-2
-3a=-21
a=7
4)-15+3c-2c-8=2-7c-7
-23+8c=-5
c=31:8
c=7 7/8
5) х/3 + 5=х/4+3
1х/12=-2
х=-24
6) 1,2d-2d-0,5=-0,7d-2
-1,5d=-1,5
d=1
7)y/9-(у+1/3)=1/6-8у/9-0.5
ответ:не возможно решить, так как
у/9+8у/9-у=0
8)а-1.8/а+1.4=0.1/0.3
а-1.8=(0.1а-0.18)/0.3
2а=0
а=0