I didn’t have chess
I didn’t have mobile phone
I didn’t have time to do it
1) х + 4,5 = 7;
х=7-4,5;
х= 2,5;
В.: 2,5.
2) у+3,9 = 6;
у= 6-3,9;
у= 2,1
В.:2,1.
3) т+ 2 1/3=4
т=4 - 2 1/3
т=1 2/3
В. 1 2/3
4) н + 5 = 7,4
н= 7,4 - 5
н = 2,4
В. 2,4
3 3/4*x*(1/3+0,4)=1,1
3 3/4*x*(1/3+2/5)=1,1
15/4*x*11/15=1,1
11/4*x=11/10
x=11/10÷11/4
x=2/5
x=0,4