Ответы и объяснения

2013-05-13T11:46:53+00:00

4(0,7x-4)-3(-0,2+6)=0

2.8x-16-17.4=0

2.8x-33.4=0

x=33.4/2.8

x=167/14

 

9x-5-4(x-5)=0

9x-5-4x+20=0

5x+15=0

x=-15/5

x=-3

 

10(1-0,2у)-(1-у)=17

10-2y-1+y-17=0

y=-8

 

5*(2+3х)-(7х-10)=4

10+15x-7x+10-4=0

16+8x=0

x=-16/8
x=-2