<span>3^x-2 = 27</span>
<span>3^x-2=3^3</span>
<span>x-2=3</span>
<span>x=5</span>
Ответ:
1)2x-(x+4)=5(x-2)
2x-x-4=5x-10
x-4=5x-10
x-5x=4-10
-4x=-6
x=1,5
2)(5x-2)×(1/4x-9)=0
1. 5x-2=0 или 1/4x-9=0
5x=2 1/4x=9
x=0,4 x=36
3)|2x-4|+3=5
2x-4=2 или 2x-4=-2
2x=6 2x=2
x=3 x=1
4)7-2(x-3)=5x-8(x-3)
7-2x+6=5x-8x+24
13-2x=-3x+24
13-24=2x-3x
-11=-x
x=11
а)0.4*7х+0.4(-2)-1.6+1.7х
б)1.2а-4+40-4.8а
в)2.5*4+2.5*(-3у)-у+2.3
г)14-3.6b-12-10,4b