Упражнении дли повторении курса 7-9 классов — Неравенства — 798 — стр. 202

$0.3(2m-3)<3(0.6m+1.3)$

$0.6m-0.9<1.8m+3.9$

$1.2m>-4.8$

$m>-4$.

$1.1(5x-4)>0.2(10x-43)$

$5.5x-4.4>2x-8.6$

$3.5x>-4.2$

$x>-1.2$.

$10-5(0.3a-0.2)\ge 5-10(0.1a+0.2)$

$10-1.5a+1\ge 5-a-2$

$0.5a\le 8$

$a\le 16$.

$3.2(2b+1)+5.7\le 7.3-1.6(3-5b)$

$6.4b+3.2+5.7\le 7.3-4.8+8b$

$1.6b\ge 6.4$

$b\ge 4$.

$4.3x-\frac{1}{2}(2.8x-0.6)>\frac{1}{3}(3x+0.6)+2.9x$

$4.3x-1.4x+0.3>x+0.2+2.9x$

$3.9x-2.9x<0.3-0.2$

$x<0.1$.

$\frac{2}{5}(5.5m-2)-0.8m<4.6m-\frac{3}{4}(3.6m-1.6)$

$2.2m-0.8-0.8m<4.6m-2.7m+1.2$

$1.9m-1.4m>-0.8-1.2$

$0.5m>-2$

$m>-4$.

$(2.1y+2)(0.2y-3)-(0.7y-1)(0.6y+4)\ge -83$

$0.42y^2-6.3y+0.4y-6-0.42y^2-2.8y+0.6y+4\ge -83$

$-8.1y\ge -83+2$

$8.1y\le 81$

$y\le 10$.

$(1-3.6a)(0.2a+3)+(4+0.9a)(0.8a+10)\le 42.2$

$0.2a+3-0.72a^2-10.8a+3.2a+40+0.72a^2+9a\le 42.2$

$1.6a\le 42.2-43$

$1.6a\le -0.8$

$a\le -0.5$.