1/2+5/2=6/2=3;
3=3.................
4-9х^2=0
(2-3x)(2+3x)=0
1)2 - 3x=0
-3x=-2
x= 2/3
2)2+3x=0
3x=-2
x= -2/3
1) общий знаменатель 12: 1 3/4 = 7/4 = 21/12, 3 5/12 = 41/12
2) -----///----- 100: 1 7/20 = 27/20 = 135/100 = 1 35/100, 2 3/50 = 103/50 = 206/100 = 2 6/100
3) -----///-----100: 6 7/100 = 607/100, 4 9/10 = 49/10 = 490/100