<span>x:28=35687
х=35687*28
х=999236
999236:28=35687
</span>35687=35687
1)60/100=3/5
2) 156/312 = 1/2
3) 540/189=27/7=3 6/7
3,4п=3-0,45
3,4п=2,55
п=2,55:3,4
п=0,75
3,4*0,75+0,45=3
7х=140/2
7х=70
х=70/7
х=10
х/4=84+16
х/4= 100
х=100/4
х=25
72/х=4*9
72/х=36
х=72/36
х=2
{x-y=2 {-y=x+2 {y=-x-2
{x×y=48 {x=48×y {x=48×(-x-2)
x=48(-x-2) y=-x-2
x=-48x-96 -y=x+2
x+48x=-96 -y=2+2
49x=-96 y=-4
x=-96/-49
x=96/49
x~=2