<span>-2m * (-3n + 2) + 4m = 6mn - 4m + 4m = 6mn
5x + 0,8 = 4х - 1,9
5х - 4х = -1,9 - 0,8
х = -2,7
а : 12 = 10 : 21 |*12
а = 120 / 21
а = 40/7
а = 5 5/7</span>
=3*20/10+6*5+4=3*2+30+4=6+30+4=40
100- <span>54 1/3=45 2/3 1 число
58 1/2 - </span><span>45 2/3 = 12 5/6 2 число
54 1/3 -</span><span><span> 12 5/6 =</span> 41 1/2 3 число
</span>