<span><span><span>0,3+0,2x≥0,6x-4,1</span></span></span>
<span><span><span /><span>0,3+4,1≥0,6x-0,2x</span></span></span>
<span><span><span /></span><span>0,4x≤</span>4,4</span>
<span>x≤4,4/0,4</span>
<span /><span><span>x≤11 </span>
</span>
<span>R+16,23-15,8=7,1
R + 0,43 = 7,1
R = 7,1 - 0,43
R = 6,67
</span>
1) B (10+40-не подходит, 20+30-подходит, т.к. 30 на 10 больше чем 20);
2) A (33+13+22+32=100, 100/4=25);
3) B (18+10+4+8=40, 40/4=10);
4) C (60/20=3, 36/12=3, 72/24=3);
5) B (15*3=45, 20*3=60, 25*3=75, 30*3=90);
6) B (91/13=7, 7+10=17);
7) 75/15=15; 51/3=17; 56/4=14; 78/6=13;
8) A (x*7=98; 98/7=14);
9) C (72/6=12, 96/8=12);
10) A (6+5=11, 6+6+11+11=34);
(X+3,1)-(x-0,9)=x+3,1-x+0,9=5