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Ответ

Ответ дан
sofiavankova20002

Объяснение:

1.А) 3/5x = 15 |÷(3/5)

x=15÷3/5

x=5×5

x=25

Б) 8x+7=13

8x=13-7

8x=6|÷8

x=6/8

x=3/4

В)3y-5=-14

3y=5-14

3y=-9 |÷3

y=-3

Г)2/3y=12|÷2/3

y=12÷2/3

y=12×3/2

y=6×3

y=18

2.А) (3x+4)-(2x-7)=-x

3x+4-2x+7=-x

3x-2x+x=-7-4

2x=-11

x= -11/2

x=-5,5

Б)(x-3)+(5-x)=2

x-3+5-x=2

2=2

3. А) 3,1c+(1,5-2,2c)=3,1c+1,5-2,2c=0,9c+1,5=7,2+1,5 =8,7

Б) 1,3f-3,4+5(1,6f-0,2) = 1,3f-3,4+8f-1=

9,3f-4,4

9,3×1/3-4,4=-1,3

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