<span>1,35:2,7+6,02-5,9+0,4:2,5*(4,2-1,075)=1,31. 4,2-1,075=3,1252. 1,35:2,7=0,53. 0,4:2,5 = 0,16</span>
<span>4. 0,16 * 3,125 =0,55. 0,5+6,2-5,9+0,5=1,3</span>
{x + 2y = 5
{0x + 4y - y = 10 - 1
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{3y = 9
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{y = 3
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{x + 0y = 5 - 6
{x = -1
Ответ: (-1; 3)