223
1) (139-23.48):38+4.35*18=3.04+78.3=81.34
2) 70.336:14+46.6:100-0.123=5.367
224
1) 7x+2x=3.528
9x=3.528
x=0.392
2) 14x-6x-0.16=5.5
8x=5.66
x=0.7075
3) 5y+10.8=21.42
5y=10.62
y=2.124
4) 3.17-11x=2.4
-11x=-0.77
x=0.07
4(х-2)+100=х²
4х-8+100=х²
х²-4х-92=0
Д=16+368=384
х1=(4+8√6)/2=2(2+4√6)/2=2+4√6
х2=(4-8√6)/2=2(2-4√6)/2=2-4√6