Ответ:
Пошаговое объяснение:
<em>1). х- 4 1/2 =-2 1/4</em>
<em> х=-2 1/4 +4 1/2 =-2 1/4 + 4 (1*2)/(2*2)=-2 1/4 + 4 2/4= 2 1/4</em>
<em> </em><em> х= 2 1/4</em>
<em>2). -х - 6 4/5= - 3 1/2</em>
<em> -х = - 3 1/2 +6 4/5= - 3 (1*5)/(2*5) + 6 (4*2)/(5*2)=-3 5/10 + 6 8/10= 3 3/10</em>
<em> </em><em> х=- 3 3/10</em>
<em>3). -х-11 1/2 = - 4 7/8</em>
<em> х= -11 1/2 + 4 7/8= -11 (1*4)/(2*4) + 4 7/8= -11 4/8+4 7/8=-92/8+39/8=</em>
<em> = -53/8= -6 5/8</em>
<em> </em><em> х= - 6 5/8</em>
12,13,14,15,16,17.18.19,23 24,25,26,27,28,29,34,35,36,37,38,39,45,46,47,48,49,56,57,58,59,67.68,69,78,79,89.
1) -42x=-84
2) x= -84: (-42)
3) x= 2