А) 2/5 и 5/12 = 8/60 и 25/60Б) 5/12 и 7/8 = 10/24 и 21/24В) 6/17 и 11/34 = 204/578 и 187/578Г) 5/16 и 5/12 = 15/48 и 20/48Д) 7/33 и 3/77 = 48/231 и 9/231Е) 5/22 и 2/55 = 25/110 и 4/110Ж) 4/15 и 3/20 = 16/60 и 9/60З) 5/121 и 8/99 = 40/1089 и 88/1089И) 1/72 и 1/56 = 7/504 и 9/504К) 1/48 и 1/72 = 3/144 и 2/144Л) 2/77и 3/44 = 8/308 и 21/308М) 1/51 и 1/68 = 4/204 и 3/204Н) 5/36 и 7/54 = 15/108 и 14/108О) 9/35 и 11/45 = 81/315 и 77/315П) 4/49 и 5/63 = 36/441 и 35/441Р) 15/98 и 13/72 = 540/3528 и 637/3528 вот чтото типо того)
2*(x+2.5)-4*(1.5-1)=-3
2x+5-6+4=-3
2x=-3-5+6-4
2x=-6
x=-6/2
x=-3
Проверка: 2*(-3+2.5)-4*(1.5-1)=-3
2*-0.5-4*0.5=-3
-1-2=-3
-3=-3
3*(1.6x-0.2)-2*(0.6x+2.5)=x+2.2
4.8x-0.6-1.2x-5=x+2.2
4.8x-1.2x-x=2.2+0.6+5
2.6x=7.8
x=7.8/2.6
x=3
Проверка: 3*(1.6*3-0.2)-2*(0.6*3+2.5)=3+2.2
3*4.6-2*4.3=5.2
13.8-8.6=5.2
5.2=5.2
1.8*(5-2x)-2*(0.8x+2.5)=8-1.2x
9-3.6x-1.6x-5=8-1.2x
-3.6x-1.6x+1.2x=8-9+5
-4x=4
x=4/-4
x=-1
Проверка: 1.8*(5-2*(-1))-2*(0.8*(-1)+2.5)=8-1.2*(-1)
1.8*7-2*1.7=8+1.2
12.6-3.4=9.2
9.2=9.2