X+2=-x+14, x+x=14-2, 2x=12, x=12/2, x=6; 2x-3=x+1, 2x-x=1+3, x=4.
0.15x+252=300
0.15x=48
x=320
Ответ:
(8целых 11/14-y)+2/7=59/14
8 11/14 - у=59/14-2/7
8 11/14 - у =55/14
у=8 11/14-55/14=123/14-55/14 = 68/14 = 34/7 = 4 6/7
у = 4 6/7
1) 1.<span>69 * 0,63=43,47
2. </span>10,098 : 5,4=1,870074074074074
3. 43,47-1,<span>870074074074074=41,59992592592593
4. </span>41,59992592592593- 20,54=21,05992592592593
5.21,05992592592593: 0, 324=64,9997713763146≈65
2) 1. <span>0,98 * 3,8=41,724
2. </span><span>0,132 : 5,5=0,0240909090909091
3. </span>41,724-0,0240909090909091=41,69990909090909
4. 41,69990909090909-2,45=39,24990909090909≈39,25