<span>20 - (2x + 5,4) = 1,21
20 - 2х - 5,4 = 1,21
-2х = 1,21 - 20 + 5,4
-2х = -13,39
<u>х = 6,695</u>
</span>
2 3/10*1,1=2,3*1,1=2,53 71/100*6,3=0,71*6,3=4,473 4 1/5*2,5=4,2*2,5=10,5 7 1/20*1,4=7,05*1,4=9,87 6 1/4*3,3=6,25*3,3=20,656 11/50*3,3=0,22*3,3=0,726 4 1/2*5,4=4,5*5,4=24,3 6,5*1/2=6,5*0,5=3,25
2 - 120 1-3600 1 - 1440 1-420. 3-72