<span>А) - 2.4-(6.3-1.62)=-2.4-4.68=-7.08
</span>Б)68/9+(-28/9+34/7)=68/9+одна целая 47/63 = 9 целых 19/63
<span>В)(14/5+15/6)-2.1-(5.8-7.9)=5.3-2.1+2.1=5.3</span>
Х = 7 целых 1/2 : 2целых 5/8
х = 2 целых 6/7
6 2/5
6x5+2=32
32:5=6.4
II
2:5=0.4
6+0.4=6.4
150/y+7=480/40
150/y=12-7
5y=150
y=150/5
y=30