Question

7) - 0, 6(x - 3) - 3, 3 = 0, 6(4 - x) 8) x-3 x+5 = 5 8 .​

Answer 1

Ответ:

1)0,6-1,6*(x-4)=3*(7-0,4x)

0,6-1,6x+6,4=21-1,2x

-1,6x+1,2x=-0,6-6,4+21

-0,4x=14

x=14:(-0,4)

x=-35

0,6-1,6*(-35-4)=3*(7-0,4*(-35)

0,6+62,4=3*21=63

Ответ:-35

2)3/4*(1/2x+2/5)=3x+2 1/14

3/8x+3/10=3x+2 1/14

3/8x-3x=2 1/14-3/10-2 5/8=290/140-42/140

-21/8x= 248/140

-21/8x=62/35

x=62/35:(-21/8)

x=62/35*(-8/21)

x= - 496/735

3/4*(1/2*(-496/735)+2/5=3*(-496/735)+2 1/14

3/4*(+248/735+294/735)= -496/245+29/14

3/4*46/735= -992/490+1015/490= 23/490

Ответ:-496/735