2/5(3/2a+1/2b)+4/5b= 2/5*3/2a+2/5*1/2b+4/5b=6/10a+2/10b+4/5b=
6/10a+1/5b+4/5b=6/10a+5/5b=0.6a+b
(150 - х) : 2 = 65
150 - х = 65 * 2
150 - х = 130
х = 150 - 130
х = 20
13x=21 x=21/13 Ответ 21/13
1 7/9х*(-0,125у)*4,5z= -16/9*125/1000*4 1/2*(хуz)= -16/9*1/8*8/2*(хуz)=
-8/9*хуz